NR Canis Majoris: Difference between revisions

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{{Starbox begin}}
{{more citations needed|date=February 2017}}
{{Starbox begin
|name=NR Canis Majoris}}
{{Starbox observe
{{Starbox observe
|constell=[[Canis Major]]
| constell = [[Canis Major]]
|epoch=[[J2000]]
| epoch = [[J2000]]
| ra = {{RA|07|27|07.99004}}<ref name="van Leeuwen2007"/>
| ra = {{RA|07|27|07.99004}}<ref name="van Leeuwen2007">{{cite journal | title=Validation of the new Hipparcos reduction | url=http://www.aanda.org/index.php?option=com_article&access=bibcode&Itemid=129&bibcode=2007A%2526A...474..653VFUL | last1=van Leeuwen | first1=F. | journal=Astronomy and Astrophysics | volume=474 | issue=2 | pages=653–664 | date=2007 | arxiv=0708.1752 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 }}</ref>
| dec = {{DEC|-17|51|53.5012}}<ref name="van Leeuwen2007"/>
| dec = {{DEC|-17|51|53.5012}}<ref name="van Leeuwen2007"/>
|appmag_v=5.622<ref name=SIMBAD>{{cite simbad|title=NR CMa|access-date=12 February 2017}}</ref> }}
| appmag_v = 5.60<ref name=Anderson2012/> {{nowrap|(5.66 + 9.23)}}<ref name=WDSC2014/>
}}
{{Starbox character
{{Starbox character
| type =
|class=F2V<ref name=SIMBAD/>
| class = F2V<ref name=houk1978/>
|b-v=+0.32<ref>{{cite journal|title=Photoelectric Magnitudes and Colours for 100 Southern Stars (Fifth List)|date=1964|journal=Monthly Notes of the Astron. Soc. Southern Africa|volume=23|page=136|author=Lake, R.|bibcode=1964MNSSA..23..136L}}</ref>
| b-v = {{Val|+0.314|0.002}}<ref name=Anderson2012/>
| variable = [[Delta Scuti variable|δ Sct]]<ref name=Samus2017/>
}}
}}
{{Starbox astrometry
{{Starbox astrometry
| radial_v = {{Val|−29.2|2.9}}<ref name=Anderson2012/>
|radial_v=-29.2<ref name=GCRV>{{cite journal|title=General catalogue of stellar radial velocities|author=Wilson, Ralph Elmer|date=1953|bibcode=1953GCRV..C......0W}}</ref>
|prop_mo_ra=-2.52<ref name="van Leeuwen2007"/>
| prop_mo_ra = −2.52<ref name="van Leeuwen2007"/>
|prop_mo_dec=1.45<ref name="van Leeuwen2007"/>
| prop_mo_dec = +1.45<ref name="van Leeuwen2007"/>
|parallax=10.83
| parallax = 10.83
|p_error=0.56
| p_error = 0.56
|parallax_footnote=<ref name="van Leeuwen2007"/>
| parallax_footnote = <ref name="van Leeuwen2007"/>
|absmag_v=
| absmag_v = 0.78<ref name=Anderson2012/>
}}
{{Starbox detail
| source =
| component1 = A
| mass = 1.62<ref name=David2015/> or {{Val|2.18|0.04}}<ref name=zorec2012/>
| radius =
| luminosity = {{Val|44.4|5.4|4.8}}<ref name=David2015/>
| temperature = {{Val|7136|243|fmt=commas}}<ref name=David2015/>
| metal_fe =
| rotational_velocity = 185<ref name=vanBelle2012/>
| gravity = 3.65<ref name=David2015/>
| age_gyr = 1.494<ref name=David2015/>
}}
}}
{{Starbox catalog
{{Starbox catalog
| names = {{odlist | V=NR CMa | BD=−17°1980 | HD=58954 | HIP=36186 | HR=2853 | SAO=152894 | ADS=6093 | CCDM=J07271-1752AB | WDS=J07271-1752 }}<ref name=SIMBAD/>
|names=[[Variable star designation|NR]] CMa, [[Bonner Durchmusterung|BD]]–17° 1980, [[Henry Draper Catalogue|HD]] 58954, [[Hipparcos catalogue|HIP]] 36186, [[Bright Star Catalog|HR]] 2853, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]] 152894, [[Aitken Double Star Catalog|ADS]] 6093, [[Catalog of Components of Double and Multiple Stars|CCDM]] J07271-1752AB}}
}}
{{Starbox reference
{{Starbox reference
|Simbad=HD+58954 }}
| Simbad = HD+58954
}}
{{Starbox end}}
{{Starbox end}}
'''NR Canis Majoris''' also known as '''HR 2853''', '''HD 58954''', and '''HIP 36186''', is a [[Delta Scuti]] [[variable star]] with a [[spectral classification]] of [[F-type main-sequence star|F2V]], which varies by a few hundredths of a [[apparent magnitude|magnitude]] over roughly 16 hours.<ref name=AAVSONR>{{cite web|url=http://www.aavso.org/vsx/index.php?view=detail.top&oid=5446 |title=LS Canis Majoris |author =Watson, Christopher |date=4 January 2010 |work=AAVSO Website|publisher=[[American Association of Variable Star Observers]]|accessdate=12 July 2014}}</ref> It is located to the east of [[Sirius]], and east of [[Gamma Canis Majoris]], practically on the border with Puppis.
NR Canis Majoris is 85.88 pc from the [[Sun]], according to [[Hipparcos]], and has a mass of 1.5 solar masses. It is about 2 billion years younger than the Sun.


'''NR Canis Majoris''' is a [[binary star]]<ref name=Eggleton2008/> system in the southern [[constellation]] of [[Canis Major]], located to the west of [[Sirius]] and [[Gamma Canis Majoris]] near the constellation border with [[Puppis]]. It has a yellow-white hue and is dimly visible to the naked eye with a combined [[apparent visual magnitude]] that fluctuates around 5.60.<ref name=Anderson2012/> It is located at a distance of approximately 300&bsp;[[light year]]s from the [[Sun]] based on [[stellar parallax|parallax]]. The system is drifting closer to the Sun with a [[radial velocity]] of −29&nbsp;km/s,<ref name=Anderson2012/> and in about three million years it is predicted to approach within {{Val|14.1|4.7|4.0|u=ly}}.<ref name=BailerJones2015/> At that time, the star will become the [[Historical brightest stars|brightest in the night sky]], potentially reaching magnitude −0.88.<ref name=tomkin1998/>
NR Canis Majoris will eventually become the brightest star in the sky 2.6 million years from now to 3 million years from now, one of 4 different stars in Canis Major to hold that title ([[Alpha Canis Majoris]], [[Beta Canis Majoris]], and [[Epsilon Canis Majoris]]). During this period, NR Canis Majoris will be only 14 light years away and appear at -0.88 magnitude, about the same as [[Canopus]] today.<ref>{{cite web|title=V* NR CMa|url=http://simbad.u-strasbg.fr/simbad/sim-id?Name=V*%20NR%20CMa&submit=display%20all%20measurements&Ident=%40976694|work=SIMBAD|publisher=Université de Strasbourg|accessdate=10 May 2013}}</ref>

The magnitude 5.66<ref name=WDSC2014/> primary component is an [[F-type main-sequence star]] with a [[stellar classification]] of F2V.<ref name=houk1978/> It is a [[Delta Scuti variable]]<ref name=Samus2017/> that varies by a few hundredths of a [[apparent magnitude|magnitude]] over roughly 16 hours.<ref name=AAVSONR/> The star is an estimated 1.5&nbsp;billion years old.<ref name=David2015/> It has a high rate of spin with a [[projected rotational velocity]] of 185&nbsp;km/s, which is giving the star an [[equatorial bulge]] that is estimated to be 8% larger than the polar radius.<ref name=vanBelle2012/>

The secondary companion is magnitude 9.23 and lies at an [[angular separation]] of {{Val|1.3|ul=arcsecond}} along a [[position angle]] of 39°, as of 2005.<ref name=WDSC2014/>


==References==
==References==
{{Reflist}}
{{Reflist|refs=


<ref name=SIMBAD>{{cite simbad | title=NR CMa | access-date=12 February 2017 }}</ref>
{{Stars of Canis Major}}


<ref name=WDSC2014>{{cite journal
[[Category:Canis Major]]
| display-authors=1 | last1=Mason | first1=B. D.
| last2=Wycoff | first2=G. L. | last3=Hartkopf | first3=W. I.
| last4=Douglass | first4=G. G. | last5=Worley | first5=C. E.
| title=The Washington Visual Double Star Catalog
| year=2014 | bibcode=2001AJ....122.3466M | doi=10.1086/323920
| url=http://vizier.u-strasbg.fr/viz-bin/VizieR?-source=B/wds
| accessdate=2015-07-22 }}</ref>

<ref name=vanBelle2012>{{cite journal
| last1=van Belle | first1=Gerard T.
| title=Interferometric observations of rapidly rotating stars
| journal=The Astronomy and Astrophysics Review
| volume=20 | issue=1 | page=51 | date=March 2012
| bibcode=2012A&ARv..20...51V | arxiv=1204.2572
| doi=10.1007/s00159-012-0051-2 }}</ref>

<ref name=zorec2012>{{cite journal
| last1=Zorec | first1=J. | last2=Royer | first2=F.
| title=Rotational velocities of A-type stars. IV. Evolution of rotational velocities
| journal=Astronomy & Astrophysics
| volume=537 | pages=A120 | year=2012
| bibcode=2012A&A...537A.120Z | arxiv=1201.2052
| doi=10.1051/0004-6361/201117691 }}</ref>

<ref name=David2015>{{cite journal
| last1=David | first1=Trevor J. | last2=Hillenbrand | first2=Lynne A.
| title=The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets
| journal=The Astrophysical Journal
| volume=804 | issue=2 | pages=146 | year=2015
| bibcode=2015ApJ...804..146D | arxiv=1501.03154
| doi=10.1088/0004-637X/804/2/146 }}</ref>

<ref name=BailerJones2015>{{cite journal
| last1=Bailer-Jones | first1=C. A. L.
| title=Close encounters of the stellar kind
| journal=Astronomy & Astrophysics
| volume=575 | id=A35 | pages=13 | date=March 2015
| doi=10.1051/0004-6361/201425221 | arxiv=1412.3648
| bibcode=2015A&A...575A..35B }}</ref>

<ref name=Eggleton2008>{{cite journal
| last1=Eggleton | first1=P. P. | last2=Tokovinin | first2=A. A.
| title=A catalogue of multiplicity among bright stellar systems
| journal=Monthly Notices of the Royal Astronomical Society
| volume=389 | issue=2 | pages=869–879 | date=September 2008
| doi=10.1111/j.1365-2966.2008.13596.x
| bibcode=2008MNRAS.389..869E | arxiv=0806.2878 }}</ref>

<ref name=Samus2017>{{cite journal
| display-authors=1 | last1=Samus | first1=N. N.
| last2=Kazarovets | first2=E. V. | last3=Durlevich | first3=O. V.
| last4=Kireeva | first4=N. N. | last5=Pastukhova | first5=E. N.
| title=General Catalogue of Variable Stars
| version=5.1 | journal=Astronomy Reports
| year=2017 | volume=61 | issue=1 | pages=80–88
| bibcode=2017ARep...61...80S | doi=10.1134/S1063772917010085 }}</ref>

<ref name=Anderson2012>{{cite journal
| title=XHIP: An extended hipparcos compilation
| last1=Anderson | first1=E. | last2=Francis | first2=Ch.
| journal=Astronomy Letters
| volume=38 | issue=5 | pages=331 | year=2012
| bibcode=2012AstL...38..331A | arxiv=1108.4971
| doi=10.1134/S1063773712050015 }}</ref>

<ref name="van Leeuwen2007">{{cite journal
| title=Validation of the new Hipparcos reduction
| last1=van Leeuwen | first1=F.
| journal=Astronomy and Astrophysics
| volume=474 | issue=2 | pages=653–664 | date=2007
| arxiv=0708.1752 | bibcode=2007A&A...474..653V
| doi=10.1051/0004-6361:20078357 }}</ref>

<ref name=houk1978>{{cite journal
| last1=Houk | first1=Nancy | last2=Smith-Moore | first2=M.
| title=Michigan catalogue of two-dimensional spectral types for the HD stars
| volume=4 | publication-place=Ann Arbor | year=1978
| publisher=Department of Astronomy, University of Michigan
| bibcode=1988mcts.book.....H }}</ref>

<ref name=AAVSONR>{{cite web
| url=http://www.aavso.org/vsx/index.php?view=detail.top&oid=5446
| title=LS Canis Majoris
| last=Watson | first=Christopher
| date=4 January 2010 | work=AAVSO Website
| publisher=[[American Association of Variable Star Observers]]
| accessdate=12 July 2014 }}</ref>

<ref name=tomkin1998>{{cite journal
| last=Tomkin | first=Jocelyn | date=April 1998
| title=Once and Future Celestial Kings | journal=Sky and Telescope
| volume=95 | issue=4 | pages=59–63
| bibcode=1998S&T....95d..59T }}</ref>

}}

{{Stars of Canis Major}}
<!-- Properties -->
[[Category:F-type main-sequence stars]]
[[Category:F-type main-sequence stars]]
[[Category:Objects with variable star designations|Canis Majoris, NR]]
[[Category:Henry Draper Catalogue objects|058954]]
[[Category:HR objects|2853]]
[[Category:Hipparcos objects|036186]]
[[Category:Delta Scuti variables]]
[[Category:Delta Scuti variables]]
[[Category:Binary stars]]
<!-- Identifiers -->
[[Category:Canis Major]]
[[Category:Durchmusterung objects]]
[[Category:Durchmusterung objects]]
[[Category:Henry Draper Catalogue objects|058954]]

[[Category:Hipparcos objects|036186]]

[[Category:HR objects|2853]]
{{main-star-stub}}
[[Category:Objects with variable star designations|Canis Majoris, NR]]

Revision as of 20:09, 10 December 2019

NR Canis Majoris
Observation data
Epoch J2000      Equinox J2000
Constellation Canis Major
Right ascension 07h 27m 07.99004s[1]
Declination −17° 51′ 53.5012″[1]
Apparent magnitude (V) 5.60[2] (5.66 + 9.23)[3]
Characteristics
Spectral type F2V[4]
B−V color index +0.314±0.002[2]
Variable type δ Sct[5]
Astrometry
Radial velocity (Rv)−29.2±2.9[2] km/s
Proper motion (μ) RA: −2.52[1] mas/yr
Dec.: +1.45[1] mas/yr
Parallax (π)10.83 ± 0.56 mas[1]
Distance300 ± 20 ly
(92 ± 5 pc)
Absolute magnitude (MV)0.78[2]
Details
A
Mass1.62[6] or 2.18±0.04[7] M☉
Luminosity44.4+5.4
−4.8[6] L☉
Surface gravity (log g)3.65[6] cgs
Temperature7,136±243[6] K
Rotational velocity (v sin i)185[8] km/s
Age1.494[6] Gyr
Other designations
NR CMa, BD−17°1980, HD 58954, HIP 36186, HR 2853, SAO 152894, ADS 6093, CCDM J07271-1752AB, WDS J07271-1752[9]
Database references
SIMBADdata

NR Canis Majoris is a binary star[10] system in the southern constellation of Canis Major, located to the west of Sirius and Gamma Canis Majoris near the constellation border with Puppis. It has a yellow-white hue and is dimly visible to the naked eye with a combined apparent visual magnitude that fluctuates around 5.60.[2] It is located at a distance of approximately 300&bsp;light years from the Sun based on parallax. The system is drifting closer to the Sun with a radial velocity of −29 km/s,[2] and in about three million years it is predicted to approach within 14.1+4.7
−4.0 ly.[11] At that time, the star will become the brightest in the night sky, potentially reaching magnitude −0.88.[12]

The magnitude 5.66[3] primary component is an F-type main-sequence star with a stellar classification of F2V.[4] It is a Delta Scuti variable[5] that varies by a few hundredths of a magnitude over roughly 16 hours.[13] The star is an estimated 1.5 billion years old.[6] It has a high rate of spin with a projected rotational velocity of 185 km/s, which is giving the star an equatorial bulge that is estimated to be 8% larger than the polar radius.[8]

The secondary companion is magnitude 9.23 and lies at an angular separation of 1.3″ along a position angle of 39°, as of 2005.[3]

References

  1. ^ a b c d e van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.
  2. ^ a b c d e f Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015.
  3. ^ a b c Mason, B. D.; et al. (2014). "The Washington Visual Double Star Catalog". Bibcode:2001AJ....122.3466M. doi:10.1086/323920. Retrieved 2015-07-22. {{cite journal}}: Cite journal requires |journal= (help)
  4. ^ a b Houk, Nancy; Smith-Moore, M. (1978). "Michigan catalogue of two-dimensional spectral types for the HD stars". 4. Ann Arbor: Department of Astronomy, University of Michigan. Bibcode:1988mcts.book.....H. {{cite journal}}: Cite journal requires |journal= (help)
  5. ^ a b Samus, N. N.; et al. (2017). "General Catalogue of Variable Stars". Astronomy Reports. 5.1. 61 (1): 80–88. Bibcode:2017ARep...61...80S. doi:10.1134/S1063772917010085.
  6. ^ a b c d e f David, Trevor J.; Hillenbrand, Lynne A. (2015). "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets". The Astrophysical Journal. 804 (2): 146. arXiv:1501.03154. Bibcode:2015ApJ...804..146D. doi:10.1088/0004-637X/804/2/146.
  7. ^ Zorec, J.; Royer, F. (2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy & Astrophysics. 537: A120. arXiv:1201.2052. Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691.
  8. ^ a b van Belle, Gerard T. (March 2012). "Interferometric observations of rapidly rotating stars". The Astronomy and Astrophysics Review. 20 (1): 51. arXiv:1204.2572. Bibcode:2012A&ARv..20...51V. doi:10.1007/s00159-012-0051-2.
  9. ^ "NR CMa". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 12 February 2017.
  10. ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society. 389 (2): 869–879. arXiv:0806.2878. Bibcode:2008MNRAS.389..869E. doi:10.1111/j.1365-2966.2008.13596.x.
  11. ^ Bailer-Jones, C. A. L. (March 2015). "Close encounters of the stellar kind". Astronomy & Astrophysics. 575: 13. arXiv:1412.3648. Bibcode:2015A&A...575A..35B. doi:10.1051/0004-6361/201425221. A35.
  12. ^ Tomkin, Jocelyn (April 1998). "Once and Future Celestial Kings". Sky and Telescope. 95 (4): 59–63. Bibcode:1998S&T....95d..59T.
  13. ^ Watson, Christopher (4 January 2010). "LS Canis Majoris". AAVSO Website. American Association of Variable Star Observers. Retrieved 12 July 2014.
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