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'''Beta&nbsp;Monocerotis''' ('''Beta&nbsp;Mon''', '''β&nbsp;Monocerotis''', '''β&nbsp;Mon''') is a triple [[star system]] in the [[constellation]] of [[Monoceros (constellation)|Monoceros]].<ref name=kaler>{{cite web|url=http://stars.astro.illinois.edu/sow/betamon.html|title = Beta Mon|author=Jim Kaler|website=Stars|accessdate=2018-01-29}}</ref> To the naked eye, it appears as a single star with an [[apparent visual magnitude]] of approximately 3.74, making it the brightest visible star in the constellation.<ref name=bsc1 /> A telescope shows a curved line of three pale blue stars (or pale yellow stars, depending on the scope's focus). [[William Herschel]] who discovered it in 1781 commented that it is "one of the most beautiful sights in the heavens". The star system consists of three [[Be stars]], β&nbsp;Monocerotis&nbsp;A, β&nbsp;Monocerotis&nbsp;B, and β&nbsp;Monocerotis&nbsp;C. There is also an additional [[double star|visual companion]] star that is probably not physically close to the other three stars.<ref name=kaler />

==Beta Monocerotis A==
{{Starbox begin
{{Starbox begin
| name = [[Bayer designation|β&nbsp;Monocerotis&nbsp;A]]}}
| name = β Monocerotis
}}
{{Starbox observe
{{Starbox image
| image=
{{Location mark
|image=Monoceros constellation map.svg|alt=|float=center|width=280
|label=|position=right
|mark=Red circle.svg|mark_width=10|mark_link=β Mon
|x=588|y=490
}}
|caption=Location of β Monocerotis (circled)
}}
{{Starbox observe 3s
| epoch = [[J2000.0]]
| epoch = [[J2000.0]]
| equinox = [[J2000.0]] ([[International Celestial Reference System|ICRS]])
| equinox = [[J2000.0]] ([[International Celestial Reference System|ICRS]])
| constell = [[Monoceros (constellation)|Monoceros]]
| constell = [[Monoceros (constellation)|Monoceros]]
| component1 = A
| ra = {{RA|06|28|49.0700}}<ref name=sb0>{{cite simbad|title=* bet01 Mon|accessdate=November 21, 2008}}</ref>
| ra1 = {{RA|06|28|49.0700}}<ref name=hip1>Entry, [http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/239/h_dm_com&recno=6373 component 1], HIP 30867, ''The Hipparcos and Tycho Catalogues'', 1997, [[Centre de Données astronomiques de Strasbourg|CDS]] ID [http://cdsarc.u-strasbg.fr/viz-bin/Cat?I/239 I/239], accessed on line November 21, 2008.</ref>
| dec = {{DEC|−07|01|59.025}}<ref name=sb0 />
| appmag_v=4.60<ref name=sb0 />
| dec1 = {{DEC|−07|01|59.025}}<ref name=hip1/>
| appmag_v1=4.60<ref name=cutri>{{cite journal|bibcode=2002yCat.2237....0D|title=VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system|journal=CDS/ADC Collection of Electronic Catalogues|volume=2237|author1=Ducati|first1=J. R|year=2002}}</ref>
| component2 = B
| ra2 = {{RA|06|28|49.4238}}<ref name=hip2>Entry, [http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/239/h_dm_com&recno=6374 component 2], HIP 30867, ''The Hipparcos and Tycho Catalogues'', 1997, [[Centre de Données astronomiques de Strasbourg|CDS]] ID [http://cdsarc.u-strasbg.fr/viz-bin/Cat?I/239 I/239], accessed on line November 21, 2008.</ref>
| dec2 = {{DEC|−07|02|03.876}}<ref name=bsc2/>
| appmag_v2=5.00<ref name=cutri/>
| component3 = C
| ra3 = {{RA|06|28|49.6128}}<ref name=hip3>Entry, [http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/239/h_dm_com&recno=6375 component 3], HIP 30867, ''The Hipparcos and Tycho Catalogues'', 1997, [[Centre de Données astronomiques de Strasbourg|CDS]] ID [http://cdsarc.u-strasbg.fr/viz-bin/Cat?I/239 I/239], accessed on line November 21, 2008.</ref>
| dec3 = {{DEC|−07|02|04.763}}<ref name=hip3 />
| appmag_v3=5.32<ref name=cutri/>
}}
}}
{{Starbox character
{{Starbox character
| component1 = A
| class = B3Ve<ref name=sb0 />
| class = B4Veshell<ref name=shell>{{cite journal|bibcode=1982ApJS...50...55S|title=Spectral types and rotational velocities of the brighter Be stars and A-F type shell stars|journal=Astrophysical Journal Supplement Series|volume=50|pages=55|author1=Slettebak|first1=A|year=1982|doi=10.1086/190820}}</ref>
| u-b = −0.63<ref name=bsc1>[http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=V/50/catalog&recno=2356 HR 2356], database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., [[Centre de Données astronomiques de Strasbourg|CDS]] ID [http://vizier.u-strasbg.fr/viz-bin/Cat?V/50 V/50]. Accessed on line November 21, 2008.</ref>
| u-b = −0.63<ref name=bsc1>[http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=V/50/catalog&recno=2356 HR 2356], database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., [[Centre de Données astronomiques de Strasbourg|CDS]] ID [http://vizier.u-strasbg.fr/viz-bin/Cat?V/50 V/50]. Accessed on line November 21, 2008.</ref>
| b-v = −0.10<ref name=bsc1 />
| b-v = −0.10<ref name=bsc1 />
| r-i = −0.16<ref name=bsc1 />
| r-i = −0.16<ref name=bsc1 />
}}
}}
{{Starbox astrometry
{{Starbox character|no_heading=y
| component1 = B
| radial_v = 20&nbsp;±&nbsp;5<ref name=sb0 />
| class = B2vn(e)<ref name=cowley>{{cite journal|bibcode= 1973A&A....22..203C |title= Cyclic variations of the Be star beta 1 Monocerotis |journal= Astronomy and Astrophysics |volume= 22 |pages= 203 |author1= Cowley |first1= A |last2= Gugula |first2= E |year= 1973 }}</ref>
| prop_mo_ra = −7.00<ref name=sb0 />
| prop_mo_dec = −4.97<ref name=sb0 />
| parallax = 4.72
| p_error = 1.10
| parallax_footnote = <ref name=sb0 />
| absmag_v= −2.0<ref group=note name=mgp>From apparent magnitude and parallax.</ref>
}}
{{Starbox detail
| rotational_velocity = 346<ref name=bsc1 />
| mass = 7<ref name=kaler />
| luminosity = 3,200<ref name=kaler />
}}
{{Starbox catalog
| names=β&nbsp;Mon&nbsp;A, Beta&nbsp;Monocerotis&nbsp;A, Beta&nbsp;Mon&nbsp;A, [[Bayer designation|β<sup>1</sup>&nbsp;Monocerotis]], β<sup>1</sup>&nbsp;Mon, Beta<sup>1</sup>&nbsp;Monocerotis, Beta<sup>1</sup>&nbsp;Mon, [[Flamsteed designation|11&nbsp;Monocerotis&nbsp;A]], 11&nbsp;Mon&nbsp;A, [[Double star designation|STF 919A]], [[Aitken Double Star Catalogue|ADS]]&nbsp;5107&nbsp;A, [[Durchmusterung|BD]]−06°1574, [[Catalog of Components of Double and Multiple Stars|CCDM]]&nbsp;J06288-0702A, [[Boss General Catalogue|GC]]&nbsp;8412, [[Henry Draper Catalogue|HD]]&nbsp;45725, [[Hipparcos Catalogue|HIP]]&nbsp;30867,<ref group=note name=hipnote>The [[Hipparcos Catalogue]] entry for HIP 30867 includes all three of β Monocerotis A, B, and C. See [http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/239/h_dm_com&recno=6373 component 1],
[http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/239/h_dm_com&recno=6374 component 2], and
[http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/239/h_dm_com&recno=6375 component 3], entries for HIP 30867, ''The Hipparcos and Tycho Catalogues'', 1997, [[Centre de Données astronomiques de Strasbourg|CDS]] ID [http://cdsarc.u-strasbg.fr/viz-bin/Cat?I/239 I/239], accessed on line November 21, 2008.</ref> [[Bright Star Catalogue|HR]]&nbsp;2356, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]]&nbsp;133316, [[Washington Double Star Catalog|WDS]]&nbsp;06288-0702A.<ref name=sb0 /><ref name=wds>Entry 06288-0702,
[http://ad.usno.navy.mil/wds/Webtextfiles/wdsnewframe2.html The Washington Double Star Catalog],
[[United States Naval Observatory]]. Accessed on line November 21, 2008.</ref>}}
{{Starbox reference
| Simbad=bet+Mon+A}}
{{Starbox end}}
'''Beta&nbsp;Monocerotis&nbsp;A''' ('''Beta&nbsp;Mon&nbsp;A''', '''β&nbsp;Monocerotis&nbsp;A''', '''β&nbsp;Mon&nbsp;A''') is a [[Shell star|Be shell star]] with a mass of approximately 7 [[solar masses]] and a [[luminosity]] of 3,200 times the [[Sun]]'s.<ref name=kaler /><ref name=rivinius>{{cite journal|doi=10.1051/0004-6361:20053008 |title=Bright Be-shell stars |journal=Astronomy and Astrophysics |volume=459 |pages=137 |year=2006 |last1=Rivinius |first1=Th. |last2=Štefl |first2=S. |last3=Baade |first3=D. |bibcode = 2006A&A...459..137R }}</ref>
{{-}}

==Beta Monocerotis B==
{{Starbox begin
| name = [[Bayer designation|β&nbsp;Monocerotis&nbsp;B]]}}
{{Starbox observe
| epoch = [[J2000.0]]
| equinox = [[J2000.0]] ([[International Celestial Reference System|ICRS]])
| constell = [[Monoceros (constellation)|Monoceros]]
| ra = {{RA|06|28|49.424}}<ref name=hip2>Entry, [http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/239/h_dm_com&recno=6374 component 2], HIP 30867, ''The Hipparcos and Tycho Catalogues'', 1997, [[Centre de Données astronomiques de Strasbourg|CDS]] ID [http://cdsarc.u-strasbg.fr/viz-bin/Cat?I/239 I/239], accessed on line November 21, 2008.</ref>
| dec = {{DEC|−07|02|03.88}}<ref name=hip2 />
| appmag_v=5.40<ref name=sb1>{{cite simbad|title=* bet Mon B|accessdate=November 21, 2008}}</ref>
}}
{{Starbox character
| class = B3ne<ref name=sb1 />
| u-b = −0.52<ref name=bsc2>[http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=V/50/catalog&recno=2357 HR 2357], database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., [[Centre de Données astronomiques de Strasbourg|CDS]] ID [http://vizier.u-strasbg.fr/viz-bin/Cat?V/50 V/50]. Accessed on line November 21, 2008.</ref>
| u-b = −0.52<ref name=bsc2>[http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=V/50/catalog&recno=2357 HR 2357], database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., [[Centre de Données astronomiques de Strasbourg|CDS]] ID [http://vizier.u-strasbg.fr/viz-bin/Cat?V/50 V/50]. Accessed on line November 21, 2008.</ref>
| b-v = −0.07<ref name=bsc2 />
| b-v = −0.07<ref name=bsc2 />
}}
{{Starbox character|no_heading=y
| component1 = C
| class = B3V:nne<ref name=cowley/>
| b-v = −0.1<ref name=sb2>{{cite simbad|title=* bet Mon C|accessdate=November 21, 2008}}</ref>
}}
}}
{{Starbox astrometry
{{Starbox astrometry
| radial_v = 17.20<ref name=rv>{{cite journal|bibcode= 2006AstL...32..759G |title= Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system |journal= Astronomy Letters |volume= 32 |issue= 11 |pages= 759 |author1= Gontcharov |first1= G. A |year= 2006 |doi= 10.1134/S1063773706110065 }}</ref>
| radial_v = 18&nbsp;±&nbsp;5<ref name=sb1 />
| prop_mo_ra = −7.00<ref name=hip2 />
| prop_mo_ra = −6.86<ref name=hipparcos/>
| prop_mo_dec = −4.97<ref name=hip2 />
| prop_mo_dec = −2.76<ref name=hipparcos/>
| parallax = 4.72
| parallax = 4.82
| p_error = 1.10
| p_error = 1.12
| parallax_footnote = <ref name=hipparcos>{{cite journal|bibcode=2007A&A...474..653V|title=Validation of the new Hipparcos reduction|journal=Astronomy and Astrophysics|volume=474|issue=2|pages=653|author1=Van Leeuwen|first1=F|year=2007|doi=10.1051/0004-6361:20078357}}</ref>
| parallax_footnote = <ref name=hip2 />
| absmag_v=&minus;1.55<ref name=fabregat>{{cite journal|bibcode=1990MNRAS.247..407F|title=Determination of Be-Star Parameters from Uvby-Beta Photometry and Hα Equivalent Widths|journal=Monthly Notices of the Royal Astronomical Society|volume=247|pages=407|author1=Fabregat|first1=J|last2=Reglero|first2=V|year=1990}}</ref>
| absmag_v= −1<ref group=note name=mgp />
}}
}}
{{Starbox detail
{{Starbox detail
| component1 = A
| mass = 8.7<ref name=tetzlaff>{{cite journal|bibcode=2011MNRAS.410..190T|title=A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun|journal=Monthly Notices of the Royal Astronomical Society|volume=410|pages=190|author1=Tetzlaff|first1=N|last2=Neuhäuser|first2=R|last3=Hohle|first3=M. M|year=2011|doi=10.1111/j.1365-2966.2010.17434.x}}</ref>
| temperature = 18,070<ref name=zorec>{{cite journal|bibcode=2005A&A...441..235Z|arxiv=astro-ph/0509119|title=On the evolutionary status of Be stars. I. Field Be stars near the Sun|journal=Astronomy and Astrophysics|volume=441|pages=235|author1=Zorec|first1=J|last2=Frémat|first2=Y|last3=Cidale|first3=L|year=2005|doi=10.1051/0004-6361:20053051}}</ref><ref name=fremat>{{cite journal|bibcode=2005A&A...440..305F|title=Effects of gravitational darkening on the determination of fundamental parameters in fast-rotating B-type stars|journal=Astronomy and Astrophysics|volume=440|pages=305|author1=Frémat|first1=Y|last2=Zorec|first2=J|last3=Hubert|first3=A.-M|last4=Floquet|first4=M|year=2005|doi=10.1051/0004-6361:20042229}}</ref>
| luminosity = 3,200<ref name=kaler />
| gravity = 4.06<ref name=zorec/>
| rotational_velocity = 346<ref name=bsc1 />
| age_myr = 27.5<ref name=tetzlaff/>
}}
{{Starbox detail|no_heading=y
| component1 = B
| rotational_velocity = 123<ref name=bsc2 />
| rotational_velocity = 123<ref name=bsc2 />
| mass = 6.2<ref name=kaler />
| mass = 6.2<ref name=kaler />
| luminosity = 1,600<ref name=kaler />
| luminosity = 1,600<ref name=kaler />
}}
{{Starbox detail|no_heading=y
| component1 = C
| rotational_velocity = 331<ref name=bsc4>[http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=V/50/catalog&recno=2358 HR 2358], database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., [[Centre de Données astronomiques de Strasbourg|CDS]] ID [http://vizier.u-strasbg.fr/viz-bin/Cat?V/50 V/50]. Accessed on line November 21, 2008.</ref>
| mass = 6<ref name=kaler />
| luminosity = 1,300<ref name=kaler />
}}
}}
{{Starbox catalog
{{Starbox catalog
| names=β&nbsp;Mon&nbsp;B, Beta&nbsp;Monocerotis&nbsp;B, Beta&nbsp;Mon&nbsp;B, [[Flamsteed designation|11&nbsp;Monocerotis&nbsp;B]], 11&nbsp;Mon&nbsp;B, [[Double star designation|STF 919B]], [[Aitken Double Star Catalogue|ADS]]&nbsp;5107&nbsp;B, [[Durchmusterung|BD]]−06°1575B, [[Catalog of Components of Double and Multiple Stars|CCDM]]&nbsp;J06288-0702B, [[Henry Draper Catalogue|HD]]&nbsp;45726, [[Hipparcos Catalogue|HIP]]&nbsp;30867,<ref group=note name=hipnote /> [[Bright Star Catalogue|HR]]&nbsp;2357, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]]&nbsp;133317, [[Washington Double Star Catalog|WDS]]&nbsp;06288-0702B.<ref name=sb0 /><ref name=wds /><ref name=sb1 /><ref>[http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/274/ccdm&recno=28080 CCDM J06288-0702B], entry, ''CCDM (Catalog of Components of Double & Multiple stars)'', Dommanget et al., 2002, [[Centre de Données astronomiques de Strasbourg|CDS]] ID [http://cdsarc.u-strasbg.fr/viz-bin/Cat?I/274 I/274].</ref>
| names=β&nbsp;Mon, Beta&nbsp;Monocerotis, Beta&nbsp;Mon, [[Flamsteed designation|11&nbsp;Monocerotis]], 11&nbsp;Mon, [[Double star designation|STF 919]], [[Aitken Double Star Catalogue|ADS]]&nbsp;5107, [[Catalog of Components of Double and Multiple Stars|CCDM]]&nbsp;J06288-0702, [[Hipparcos Catalogue|HIP]]&nbsp;30867,<ref group=note name=hipnote>The [[Hipparcos Catalogue]] entry for HIP 30867 includes all three of β Monocerotis A, B, and C. See [http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/239/h_dm_com&recno=6373 component 1],
[http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/239/h_dm_com&recno=6374 component 2], and
[http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/239/h_dm_com&recno=6375 component 3], entries for HIP 30867, ''The Hipparcos and Tycho Catalogues'', 1997, [[Centre de Données astronomiques de Strasbourg|CDS]] ID [http://cdsarc.u-strasbg.fr/viz-bin/Cat?I/239 I/239], accessed on line November 21, 2008.</ref> [[Washington Double Star Catalog|WDS]]&nbsp;06288-0702A.<ref name=sb0>{{cite simbad|title=* bet01 Mon|accessdate=November 21, 2008}}</ref><ref name=wds>Entry 06288-0702,
[http://ad.usno.navy.mil/wds/Webtextfiles/wdsnewframe2.html The Washington Double Star Catalog],
[[United States Naval Observatory]]. Accessed on line November 21, 2008.</ref>
| component1 = A
| names1=[[Bayer designation|β<sup>1</sup>&nbsp;Monocerotis]], β<sup>1</sup>&nbsp;Mon, Beta<sup>1</sup>&nbsp;Monocerotis, Beta<sup>1</sup>&nbsp;Mon, [[Durchmusterung|BD]]−06°1574, [[Boss General Catalogue|GC]]&nbsp;8412, [[Henry Draper Catalogue|HD]]&nbsp;45725, [[Bright Star Catalogue|HR]]&nbsp;2356
| component2 = B
| names2=[[Durchmusterung|BD]]−06°1575B, [[Henry Draper Catalogue|HD]]&nbsp;45726, [[Bright Star Catalogue|HR]]&nbsp;2357
| component3 = C
| names3=[[Durchmusterung|BD]]−06°1575C, [[Henry Draper Catalogue|HD]]&nbsp;45727, [[Bright Star Catalogue|HR]]&nbsp;2358
}}
}}
{{Starbox reference
{{Starbox reference
| Simbad=bet+Mon+B}}
| Simbad=beta+Mon
| Simbad2=beta+Mon+A|sn2=A
| Simbad3=beta+Mon+B|sn3=B
| Simbad4=beta+Mon+C|sn4=C
}}
{{Starbox end}}
{{Starbox end}}
'''Beta&nbsp;Monocerotis''' ('''Beta&nbsp;Mon''', '''β&nbsp;Monocerotis''', '''β&nbsp;Mon''') is a triple [[star system]] in the [[constellation]] of [[Monoceros (constellation)|Monoceros]].<ref name=kaler>{{cite web|url=http://stars.astro.illinois.edu/sow/betamon.html|title = Beta Mon|author=Jim Kaler|website=Stars|accessdate=2018-01-29}}</ref> To the naked eye, it appears as a single star with an [[apparent visual magnitude]] of approximately 3.74, making it the brightest visible star in the constellation.<ref name=bsc1 /> A telescope shows a curved line of three pale blue stars (or pale yellow stars, depending on the scope's focus). [[William Herschel]] who discovered it in 1781 commented that it is "one of the most beautiful sights in the heavens". The star system consists of three [[Be stars]], β&nbsp;Monocerotis&nbsp;A, β&nbsp;Monocerotis&nbsp;B, and β&nbsp;Monocerotis&nbsp;C. There is also an additional [[double star|visual companion]] star that is probably not physically close to the other three stars.<ref name=kaler />

==Beta Monocerotis A==
'''Beta&nbsp;Monocerotis&nbsp;A''' ('''Beta&nbsp;Mon&nbsp;A''', '''β&nbsp;Monocerotis&nbsp;A''', '''β&nbsp;Mon&nbsp;A''') is a [[Shell star|Be shell star]] with a mass of approximately 7 [[solar masses]] and a [[luminosity]] of 3,200 times the [[Sun]]'s.<ref name=kaler /><ref name=rivinius>{{cite journal|doi=10.1051/0004-6361:20053008 |title=Bright Be-shell stars |journal=Astronomy and Astrophysics |volume=459 |pages=137 |year=2006 |last1=Rivinius |first1=Th. |last2=Štefl |first2=S. |last3=Baade |first3=D. |bibcode = 2006A&A...459..137R }}</ref>

==Beta Monocerotis B==
'''Beta&nbsp;Monocerotis&nbsp;B''' ('''Beta&nbsp;Mon&nbsp;B''' / '''β&nbsp;Monocerotis&nbsp;B''' / '''β&nbsp;Mon&nbsp;B''') is a [[Be star]] with a mass of approximately 6.2 [[solar masses]] and a [[luminosity]] of 1,600 times the [[Sun]]'s.<ref name=kaler />
'''Beta&nbsp;Monocerotis&nbsp;B''' ('''Beta&nbsp;Mon&nbsp;B''' / '''β&nbsp;Monocerotis&nbsp;B''' / '''β&nbsp;Mon&nbsp;B''') is a [[Be star]] with a mass of approximately 6.2 [[solar masses]] and a [[luminosity]] of 1,600 times the [[Sun]]'s.<ref name=kaler />

{{-}}


==Beta Monocerotis C==
==Beta Monocerotis C==
{{Starbox begin
| name = [[Bayer designation|β&nbsp;Monocerotis&nbsp;C]]}}
{{Starbox observe
| epoch = [[J2000.0]]
| equinox = [[J2000.0]] ([[International Celestial Reference System|ICRS]])
| constell = [[Monoceros (constellation)|Monoceros]]
| ra = {{RA|06|28|49.613}}<ref name=hip3>Entry, [http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/239/h_dm_com&recno=6375 component 3], HIP 30867, ''The Hipparcos and Tycho Catalogues'', 1997, [[Centre de Données astronomiques de Strasbourg|CDS]] ID [http://cdsarc.u-strasbg.fr/viz-bin/Cat?I/239 I/239], accessed on line November 21, 2008.</ref>
| dec = {{DEC|−07|02|04.76}}<ref name=hip3 />
| appmag_v=5.60<ref name=sb2>{{cite simbad|title=* bet Mon C|accessdate=November 21, 2008}}</ref>
}}
{{Starbox character
| class = B3e<ref name=sb2 />
| b-v = −0.1<ref name=sb2 />
}}
{{Starbox astrometry
| radial_v = 23&nbsp;±&nbsp;5<ref name=sb2 />
| prop_mo_ra = −7.00<ref name=hip3 />
| prop_mo_dec = −4.97<ref name=hip3 />
| parallax = 4.72
| p_error = 1.10
| parallax_footnote = <ref name=hip3 />
| absmag_v= −1<ref group=note name=mgp />
}}
{{Starbox detail
| rotational_velocity = 331<ref name=bsc4>[http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=V/50/catalog&recno=2358 HR 2358], database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., [[Centre de Données astronomiques de Strasbourg|CDS]] ID [http://vizier.u-strasbg.fr/viz-bin/Cat?V/50 V/50]. Accessed on line November 21, 2008.</ref>
| mass = 6<ref name=kaler />
| luminosity = 1,300<ref name=kaler />
}}
{{Starbox catalog
| names=β&nbsp;Mon&nbsp;C, Beta&nbsp;Monocerotis&nbsp;C, Beta&nbsp;Mon&nbsp;C, [[Flamsteed designation|11&nbsp;Monocerotis&nbsp;C]], 11&nbsp;Mon&nbsp;C, [[Double star designation|STF 919C]], [[Aitken Double Star Catalogue|ADS]]&nbsp;5107&nbsp;C, [[Durchmusterung|BD]]−06°1575C, [[Catalog of Components of Double and Multiple Stars|CCDM]]&nbsp;J06288-0702C, [[Henry Draper Catalogue|HD]]&nbsp;45727, [[Hipparcos Catalogue|HIP]]&nbsp;30867,<ref group=note name=hipnote /> [[Bright Star Catalogue|HR]]&nbsp;2358, [[Washington Double Star Catalog|WDS]]&nbsp;06288-0702C.<ref name=sb2 /><ref name=wds />}}
{{Starbox reference
| Simbad=bet+Mon+C}}
{{Starbox end}}
'''Beta&nbsp;Monocerotis&nbsp;C''' ('''Beta&nbsp;Mon&nbsp;C''' / '''β&nbsp;Monocerotis&nbsp;C''' / '''β&nbsp;Mon&nbsp;C''') is a [[Be star]] with a mass of approximately 6 [[solar masses]] and a [[luminosity]] of 1,300 times the [[Sun]]'s.<ref name=kaler /> This star was observed to be double in [[speckle interferometric]] observations in 1988, but this has not been confirmed by later infrared observations.<ref>Table 1, ICCD speckle observations of binary stars. X - A further survey for duplicity among the bright stars, Harold A. McAlister, Brian D. Mason, William I. Hartkopf, and Michael M. Shara, ''Astronomical Journal'' '''106''', #4 (October 1993), pp. 1639–1655, {{doi|10.1086/116753}}, {{bibcode|1993AJ....106.1639M}}.</ref><ref>§4.1, A near IR adaptive optics search for faint companions to early-type multiple stars, A. A. Tokovinin, A. Chalabaev, N. I. Shatsky, and J. L. Beuzit, ''Astronomy and Astrophysics'' '''346''' (June 1999), pp. 481–486, {{bibcode|1999A&A...346..481T}}.</ref>
'''Beta&nbsp;Monocerotis&nbsp;C''' ('''Beta&nbsp;Mon&nbsp;C''' / '''β&nbsp;Monocerotis&nbsp;C''' / '''β&nbsp;Mon&nbsp;C''') is a [[Be star]] with a mass of approximately 6 [[solar masses]] and a [[luminosity]] of 1,300 times the [[Sun]]'s.<ref name=kaler /> This star was observed to be double in [[speckle interferometric]] observations in 1988, but this has not been confirmed by later infrared observations.<ref>Table 1, ICCD speckle observations of binary stars. X - A further survey for duplicity among the bright stars, Harold A. McAlister, Brian D. Mason, William I. Hartkopf, and Michael M. Shara, ''Astronomical Journal'' '''106''', #4 (October 1993), pp. 1639–1655, {{doi|10.1086/116753}}, {{bibcode|1993AJ....106.1639M}}.</ref><ref>§4.1, A near IR adaptive optics search for faint companions to early-type multiple stars, A. A. Tokovinin, A. Chalabaev, N. I. Shatsky, and J. L. Beuzit, ''Astronomy and Astrophysics'' '''346''' (June 1999), pp. 481–486, {{bibcode|1999A&A...346..481T}}.</ref>

{{-}}
==Visual companion==
==Visual companion==
{{Starbox begin
{{Starbox begin
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[[Category:Be stars]]
[[Category:Be stars]]
[[Category:Multiple stars|4]]
[[Category:Multiple stars|4]]
[[Category:Henry Draper Catalogue objects|045725]]
[[Category:Henry Draper Catalogue objects|045725/6/7]]
[[Category:Bayer objects|Monocerotis, Beta]]
[[Category:Bayer objects|Monocerotis, Beta]]
[[Category:Hipparcos objects|030867]]
[[Category:Hipparcos objects|030867]]
[[Category:Flamsteed objects|Monocerotis, 11]]
[[Category:Flamsteed objects|Monocerotis, 11]]
[[Category:Durchmusterung objects|BD-06 1574]]
[[Category:Durchmusterung objects|BD-06 1574/5]]
[[Category:Triple star systems]]
[[Category:Triple star systems]]
[[Category:Shell stars]]
[[Category:Shell stars]]
[[Category:HR objects|2356]]
[[Category:HR objects|2356/7/8]]

Revision as of 19:59, 30 January 2018

β Monocerotis
Location of β Monocerotis (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Monoceros
A
Right ascension 06h 28m 49.0700s[1]
Declination −07° 01′ 59.025″[1]
Apparent magnitude (V) 4.60[2]
B
Right ascension 06h 28m 49.4238s[3]
Declination −07° 02′ 03.876″[4]
Apparent magnitude (V) 5.00[2]
C
Right ascension 06h 28m 49.6128s[5]
Declination −07° 02′ 04.763″[5]
Apparent magnitude (V) 5.32[2]
Characteristics
A
Spectral type B4Veshell[6]
U−B color index −0.63[7]
B−V color index −0.10[7]
R−I color index −0.16[7]
B
Spectral type B2vn(e)[8]
U−B color index −0.52[4]
B−V color index −0.07[4]
C
Spectral type B3V:nne[8]
B−V color index −0.1[9]
Astrometry
Radial velocity (Rv)17.20[10] km/s
Proper motion (μ) RA: −6.86[11] mas/yr
Dec.: −2.76[11] mas/yr
Parallax (π)4.82 ± 1.12 mas[11]
Distanceapprox. 700 ly
(approx. 210 pc)
Absolute magnitude (MV)−1.55[12]
Details
A
Mass8.7[13] M☉
Luminosity3,200[14] L☉
Surface gravity (log g)4.06[15] cgs
Temperature18,070[15][16] K
Rotational velocity (v sin i)346[7] km/s
Age27.5[13] Myr
B
Mass6.2[14] M☉
Luminosity1,600[14] L☉
Rotational velocity (v sin i)123[4] km/s
C
Mass6[14] M☉
Luminosity1,300[14] L☉
Rotational velocity (v sin i)331[17] km/s
Other designations
β Mon, Beta Monocerotis, Beta Mon, 11 Monocerotis, 11 Mon, STF 919, ADS 5107, CCDM J06288-0702, HIP 30867,[note 1] WDS 06288-0702A.[18][19]
A: β1 Monocerotis, β1 Mon, Beta1 Monocerotis, Beta1 Mon, BD−06°1574, GC 8412, HD 45725, HR 2356
B: BD−06°1575B, HD 45726, HR 2357
C: BD−06°1575C, HD 45727, HR 2358
Database references
SIMBADdata
A
B
C

Beta Monocerotis (Beta Mon, β Monocerotis, β Mon) is a triple star system in the constellation of Monoceros.[14] To the naked eye, it appears as a single star with an apparent visual magnitude of approximately 3.74, making it the brightest visible star in the constellation.[7] A telescope shows a curved line of three pale blue stars (or pale yellow stars, depending on the scope's focus). William Herschel who discovered it in 1781 commented that it is "one of the most beautiful sights in the heavens". The star system consists of three Be stars, β Monocerotis A, β Monocerotis B, and β Monocerotis C. There is also an additional visual companion star that is probably not physically close to the other three stars.[14]

Beta Monocerotis A

Beta Monocerotis A (Beta Mon A, β Monocerotis A, β Mon A) is a Be shell star with a mass of approximately 7 solar masses and a luminosity of 3,200 times the Sun's.[14][20]

Beta Monocerotis B

Beta Monocerotis B (Beta Mon B / β Monocerotis B / β Mon B) is a Be star with a mass of approximately 6.2 solar masses and a luminosity of 1,600 times the Sun's.[14]

Beta Monocerotis C

Beta Monocerotis C (Beta Mon C / β Monocerotis C / β Mon C) is a Be star with a mass of approximately 6 solar masses and a luminosity of 1,300 times the Sun's.[14] This star was observed to be double in speckle interferometric observations in 1988, but this has not been confirmed by later infrared observations.[21][22]

Visual companion

CCDM J06288-0702D
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Monoceros
Right ascension 06h 28m 50.3s[23]
Declination −07° 01′ 41″[23]
Apparent magnitude (V) 12.2[23]
Position (relative to A)
Epoch of observation1999
Angular distance25.4″ [19]
Position angle47° [19]
Other designations
ADS 5107 D, BD−06°1574D, WDS 06288-0702D.[23][19]
Database references
SIMBADdata

The triple star system has a visual companion, CCDM J06288-0702D, which has an apparent visual magnitude of approximately 12 and is visible approximately 25 arcseconds away from β Monocerotis A.[19] It is probably not physically close to the other three stars, merely appearing next to them in the sky.[14]

Notes

  1. ^ The Hipparcos Catalogue entry for HIP 30867 includes all three of β Monocerotis A, B, and C. See component 1, component 2, and component 3, entries for HIP 30867, The Hipparcos and Tycho Catalogues, 1997, CDS ID I/239, accessed on line November 21, 2008.

References

  1. ^ a b Entry, component 1, HIP 30867, The Hipparcos and Tycho Catalogues, 1997, CDS ID I/239, accessed on line November 21, 2008.
  2. ^ a b c Ducati, J. R (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
  3. ^ Entry, component 2, HIP 30867, The Hipparcos and Tycho Catalogues, 1997, CDS ID I/239, accessed on line November 21, 2008.
  4. ^ a b c d HR 2357, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line November 21, 2008.
  5. ^ a b Entry, component 3, HIP 30867, The Hipparcos and Tycho Catalogues, 1997, CDS ID I/239, accessed on line November 21, 2008.
  6. ^ Slettebak, A (1982). "Spectral types and rotational velocities of the brighter Be stars and A-F type shell stars". Astrophysical Journal Supplement Series. 50: 55. Bibcode:1982ApJS...50...55S. doi:10.1086/190820.
  7. ^ a b c d e HR 2356, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line November 21, 2008.
  8. ^ a b Cowley, A; Gugula, E (1973). "Cyclic variations of the Be star beta 1 Monocerotis". Astronomy and Astrophysics. 22: 203. Bibcode:1973A&A....22..203C.
  9. ^ "* bet Mon C". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved November 21, 2008.
  10. ^ Gontcharov, G. A (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
  11. ^ a b c Van Leeuwen, F (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
  12. ^ Fabregat, J; Reglero, V (1990). "Determination of Be-Star Parameters from Uvby-Beta Photometry and Hα Equivalent Widths". Monthly Notices of the Royal Astronomical Society. 247: 407. Bibcode:1990MNRAS.247..407F.
  13. ^ a b Tetzlaff, N; Neuhäuser, R; Hohle, M. M (2011). "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun". Monthly Notices of the Royal Astronomical Society. 410: 190. Bibcode:2011MNRAS.410..190T. doi:10.1111/j.1365-2966.2010.17434.x.
  14. ^ a b c d e f g h i j k Jim Kaler. "Beta Mon". Stars. Retrieved 2018-01-29.
  15. ^ a b Zorec, J; Frémat, Y; Cidale, L (2005). "On the evolutionary status of Be stars. I. Field Be stars near the Sun". Astronomy and Astrophysics. 441: 235. arXiv:astro-ph/0509119. Bibcode:2005A&A...441..235Z. doi:10.1051/0004-6361:20053051.
  16. ^ Frémat, Y; Zorec, J; Hubert, A.-M; Floquet, M (2005). "Effects of gravitational darkening on the determination of fundamental parameters in fast-rotating B-type stars". Astronomy and Astrophysics. 440: 305. Bibcode:2005A&A...440..305F. doi:10.1051/0004-6361:20042229.
  17. ^ HR 2358, database entry, The Bright Star Catalogue, 5th Revised Ed. (Preliminary Version), D. Hoffleit and W. H. Warren, Jr., CDS ID V/50. Accessed on line November 21, 2008.
  18. ^ "* bet01 Mon". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved November 21, 2008.
  19. ^ a b c d e Entry 06288-0702, The Washington Double Star Catalog, United States Naval Observatory. Accessed on line November 21, 2008.
  20. ^ Rivinius, Th.; Štefl, S.; Baade, D. (2006). "Bright Be-shell stars". Astronomy and Astrophysics. 459: 137. Bibcode:2006A&A...459..137R. doi:10.1051/0004-6361:20053008.
  21. ^ Table 1, ICCD speckle observations of binary stars. X - A further survey for duplicity among the bright stars, Harold A. McAlister, Brian D. Mason, William I. Hartkopf, and Michael M. Shara, Astronomical Journal 106, #4 (October 1993), pp. 1639–1655, doi:10.1086/116753, Bibcode:1993AJ....106.1639M.
  22. ^ §4.1, A near IR adaptive optics search for faint companions to early-type multiple stars, A. A. Tokovinin, A. Chalabaev, N. I. Shatsky, and J. L. Beuzit, Astronomy and Astrophysics 346 (June 1999), pp. 481–486, Bibcode:1999A&A...346..481T.
  23. ^ a b c d "UCAC3 166-34162". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved November 21, 2008.
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