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{{Short description|Slow irregular giant star in the constellation Volans}}
{{Short description|Slow irregular giant star in the constellation Volans}}
{{Starbox begin}}
{{Starbox begin
| name = [[Henry Draper Catalogue|HD]] 77887
⚫
{{Starbox observe|epoch=[[J2000.0]]
}}
⚫
|constell=[[Volans]]
⚫
{{Starbox observe
⚫
|ra={{RA|09|01|08.514}}<ref name =ga1a/>
| epoch = [[J2000.0]] ([[International Celestial Reference System|ICRS]])
⚫
|dec={{DEC|-68|41|02.11}}<ref name =ga1a>{{cite Gaia DR2|5223670449536556672}}</ref>
⚫
| constell = [[Volans]]
⚫
|appmag_v={{val|5.87|0.01}}<ref>{{Cite journal|last1=Høg|first1=E.|last2=Fabricius|first2=C.|last3=Makarov|first3=V. V.|last4=Urban|first4=S.|last5=Corbin|first5=T.|last6=Wycoff|first6=G.|last7=Bastian|first7=U.|last8=Schwekendiek|first8=P.|last9=Wicenec|first9=A.|date=2000-03-01|title=The Tycho-2 catalogue of the 2.5 million brightest stars|bibcode=2000A&A...355L..27H|journal=Astronomy and Astrophysics|volume=355|pages=L27–L30|issn=0004-6361}}</ref>
⚫
| ra = {{RA|09|01|08.5140}}<ref name = EDR3/>
| dec = {{DEC|-68|41|02.1096}}<ref name = EDR3/>
| appmag_v = 5.87 ± 0.01<ref name = Tycho2000/>
}}
}}
{{Starbox character
{{Starbox character
|type=[[asymptotic giant branch|AGB]]{{cn|date=May 2021}}
| type = [[Asymptotic giant branch|AGB]]<ref name = Eggen1992/>
| class = M1 III<ref name = Houk1975/>
|class=M1III<ref name=gcvs>{{cite journal|bibcode=2009yCat....102025S|title=VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)|journal=VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S|volume=1|pages=B/gcvs|display-authors=etal|last1=Samus|first1=N. N.|last2=Durlevich|first2=O. V.|year=2009}}</ref>
|variable=[[Slow irregular variable]]<ref name=gcvs/>
| b-v = +1.63<ref name = Johnson1966/>
| u-b = +1.96<ref name = Johnson1966/>
| variable = [[Slow irregular variable|Lb]]<ref name = Jayasinghe2018/>
}}
}}
{{Starbox astrometry
{{Starbox astrometry
|radial_v={{val|13.66|0.17}}<ref name =ga1a/>
| radial_v = 12.6 ± 0.4<ref name = Gontcharov2006/>
⚫
| parallax = 4.2938
|prop_mo_ra={{val|+16.467|0.151}}
⚫
| p_error = 0.051
|prop_mo_dec={{val|-0.300|0.149}}
| parallax_footnote = <ref name = EDR3/>
⚫
|parallax=4.4276
| prop_mo_ra = +16.413<ref name = EDR3/>
⚫
|p_error=0.0810
|parallax_footnote=<ref name =ga1a/>
| prop_mo_dec = −0.069<ref name = EDR3/>
| absmag_v = −0.78<ref name = Anderson2012/>
⚫
|absmag_v=−0.78<ref name=xhip>{{Cite journal|last1=Anderson|first1=E.|last2=Francis|first2=Ch.|date=2012-05-01|title=XHIP: An extended hipparcos compilation|journal=[[Astronomy Letters]]|volume=38|issue=5|pages=331–346|doi=10.1134/S1063773712050015|issn=1063-7737|arxiv=1108.4971|bibcode=2012AstL...38..331A|s2cid=119257644}}</ref>
|pm_footnote=<ref name =ga1a/>
}}
}}
{{Starbox detail
{{Starbox detail
|radius=52.03<ref name =ga2a/>
| source = <ref name = McDonald2017/>
⚫
| mass = 1.12<ref name = Anders2019/>
|temperature=3959<ref name =ga2a>{{Cite journal|last1=Gaia Collaboration|last2=Brown|first2=A. G. A.|last3=Vallenari|first3=A.|last4=Prusti|first4=T.|last5=de Bruijne|first5=J. H. J.|last6=Babusiaux|first6=C.|last7=Bailer-Jones|first7=C. A. L.|last8=Biermann|first8=M.|last9=Evans|first9=D. W.|last10=Eyer|first10=L.|last11=Jansen|first11=F.|date=2018-08-01|title=Gaia Data Release 2. Summary of the contents and survey properties|bibcode=2018A&A...616A...1G|journal=Astronomy and Astrophysics|volume=616|pages=A1|doi=10.1051/0004-6361/201833051|arxiv=1804.09365|s2cid=49211658|issn=0004-6361}}</ref>
| radius = 56.73
|luminosity=600<ref name =ga2a/>
| luminosity = 598
⚫
|mass=1.16<ref name =ex>{{Cite journal|last1=Anders|first1=F.|last2=Khalatyan|first2=A.|last3=Chiappini|first3=C.|last4=Queiroz|first4=A. B.|last5=Santiago|first5=B. X.|last6=Jordi|first6=C.|last7=Girardi|first7=L.|last8=Brown|first8=A. G. A.|last9=Matijevic|first9=G.|last10=Monari|first10=G.|last11=Cantat-Gaudin|first11=T.|date=2019-08-01|title=Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18|bibcode=2019A&A...628A..94A|journal=Astronomy and Astrophysics|volume=628|pages=A94|doi=10.1051/0004-6361/201935765|arxiv=1904.11302|s2cid=131780028|issn=0004-6361}}</ref>
| temperature = 3,820
|gravity=0.94<ref name =ex/>
| gravity = 0.9
⚫
|metal_fe=0.12<ref name =ex/>
| metal_fe =
| rotational_velocity =
| age_gyr =
}}
{{Starbox catalog
| names = {{odlist|Gould = 45 G. Volantis|HD = 77887|HR = 3610|HIP = 44283|CPD = −68°879|GC = 12510|SAO = 250421|NSV = 18118}}
}}
}}
{{Starbox catalog|names=[[Henry Draper Catalogue|HD]]&nbsp;77887, [[Durchmusterung#Extension|CPD]]−68°879, [[Guide Star Catalog|GSC]]&nbsp;09195-03211, [[Hipparcos Catalogue|HIP]]&nbsp;44283, [[Bright Star Catalogue|HR]]&nbsp;3610, [[IRAS]]&nbsp;09005-6829, [[2MASS]]&nbsp;J09010850-6841017, [[New Catalogue of Suspected Variable Stars|NSV]]&nbsp;18118, [[PPM Star Catalogue|PPM]]&nbsp;357073, [[Smithsonian Astrophysical Observatory Star Catalog|SAO]]&nbsp;250421, [[Tycho Catalogue|TYC]]&nbsp;9195-3211-1}}
{{Starbox reference
{{Starbox reference
| Simbad = HD+77887
| Simbad = HR+3610
}}
}}
{{Starbox end}}
{{Starbox end}}


'''HD 77887''' ('''HR 3610''') is a giant star located around 700 [[light year]]s away from Earth in the constellation [[Volans]]. With an [[apparent magnitude]] of 5.87, it's barely visible to the naked eye. HD 77887 has a [[radial velocity]] of {{val|13.66|u=km/s}}, which means it is drifting away from the [[Solar System]], and is currently located 740 light years away from [[Earth]].
'''HD 77887''' ('''HR 3610''') is a solitary star located in the southern [[circumpolar constellation]] [[Volans]]. It has an [[apparent magnitude]] of 5.87,<ref name = Tycho2000/> making it faintly visible to the naked eye if viewed under ideal conditions. The star is situated at a distance of 760 [[light years]]<ref name = EDR3/> but is recceding with a [[heliocentric]] radial velocity of {{val|12.6|ul=km/s}}.<ref name = Gontcharov2006/>


HD 77887 is an ageing [[Stellar classification|M-type giant]]<ref name = Houk1975/> that is currently on the [[asymptotic giant branch]].<ref name = Eggen1992/> At present it has 1.12<ref name = Anders2019/> times the [[mass of the Sun]] but has expanded to 56.73 times its girth.<ref name = McDonald2017/> It shines at 598 [[solar luminosities]] from its enlarged [[photosphere]] at an [[effective temperature]] of 3,820 [[Kelvin|K]],<ref name = McDonald2017/> which gives it a red glow. HD 77887 is supsected to be a [[slow irregular variable]]<ref name = Jayasinghe2018/> whose brightness fluctuates at a tenth of a magnitude.<ref name = Waston2006/>
== Properties ==
This star has a [[spectral classification]] of "M1III". This means it is an [[M-type star]] that has exhausted hydrogen in its core and evolved away from the [[main sequence]]. HD 77887 has a similar mass to the [[Sun]], but has expanded to over 50 times the Sun's girth. It radiates at about 600 [[Solar luminosity|solar luminosities]], and has an [[effective temperature]] of {{val|3959|ul=K}}, which gives it a red-hue. Due to its enlarged size, HD 77887 has a weaker [[surface gravity]] than most stars, and has a similar [[metallicity]] to the Sun.

== Variability ==
HD 77887 is suspected to be a [[slow irregular variable star]] with an amplitude of about a tenth of a magnitude.<ref name=gcvs/>


== References ==
== References ==
{{reflist}}
{{reflist||refs=

⚫
<ref name = EDR3>{{Cite Gaia EDR3|5223670449536556672}}</ref>

⚫
<ref name = Tycho2000>{{cite journal |last1=Høg |first1=E. |last2=Fabricius |first2=C. |last3=Makarov |first3=V. V. |last4=Urban |first4=S. |last5=Corbin |first5=T. |last6=Wycoff |first6=G. |last7=Bastian |first7=U. |last8=Schwekendiek |first8=P. |last9=Wicenec |first9=A. |title=The Tycho-2 catalogue of the 2.5 million brightest stars |journal=Astronomy and Astrophysics |date=March 2000 |volume=355 |pages=L27–L30 |issn=0004-6361 |bibcode=2000A&A...355L..27H}}</ref>

<ref name = Houk1975>{{cite book|last1=Houk |first1=N. |last2=Cowley |first2=A. P. |title=University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations -90_ to -53_ƒ0. |date=1975 |bibcode=1975mcts.book.....H }}</ref>

<ref name = Johnson1966>{{cite journal |last1=Johnson |first1=H. L. |last2=Mitchell |first2=R. I. |last3=Iriarte |first3=B. |last4=Wisniewski |first4=W. Z. |title=UBVRIJKL Photometry of the Bright Stars |journal=Communications of the Lunar and Planetary Laboratory |date=1 January 1966 |volume=4 |pages=99–110 |bibcode=1966CoLPL...4...99J}}</ref>

<ref name = Eggen1992>{{cite journal |last1=Eggen |first1=Olin J. |title=Asymptotic giant branch stars near the sun |journal=The Astronomical Journal |date=July 1992 |volume=104 |pages=275 |doi=10.1086/116239 |issn=0004-6256 |bibcode=1992AJ....104..275E |doi-access=free}}</ref>

<ref name = Gontcharov2006>{{cite journal |last1=Gontcharov |first1=G. A. |title=Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system |journal=Astronomy Letters |date=November 2006 |volume=32 |issue=11 |pages=759–771 |doi=10.1134/S1063773706110065 |issn=1063-7737 |bibcode=2006AstL...32..759G |arxiv=1606.08053|s2cid=119231169 }}</ref>

⚫
<ref name = Anderson2012>{{cite journal |last1=Anderson |first1=E. |last2=Francis |first2=Ch. |title=XHIP: An extended hipparcos compilation |journal=Astronomy Letters |date=May 2012 |volume=38 |issue=5 |pages=331–346 |doi=10.1134/S1063773712050015 |language=en |issn=1063-7737 |bibcode=2012AstL...38..331A |arxiv=1108.4971}}</ref>

<ref name = McDonald2017>{{cite journal |bibcode=2017MNRAS.471..770M |title=Fundamental parameters and infrared excesses of Tycho-Gaia stars |last1=McDonald |first1=I. |last2=Zijlstra |first2=A. A. |last3=Watson |first3=R. A. |journal=Monthly Notices of the Royal Astronomical Society |year=2017 |volume=471 |issue=1 |page=770 |doi=10.1093/mnras/stx1433 |arxiv=1706.02208 |doi-access=free}}</ref>

⚫
<ref name = Anders2019>{{cite journal |display-authors=1 |last1=Anders |first1=F. |last2=Khalatyan |first2=A. |last3=Chiappini |first3=C. |last4=Queiroz |first4=A. B. |last5=Santiago |first5=B. X. |last6=Jordi |first6=C. |last7=Girardi |first7=L. |last8=Brown |first8=A. G. A. |last9=Matijevic |first9=G. |last10=Monari |first10=G. |last11=Cantat-Gaudin |first11=T. |last12=Weiler |first12=M. |last13=Khan |first13=S. |last14=Miglio |first14=A. |last15=Carrillo |first15=I. |last16=Romero-Gómez |first16=M. |last17=Minchev |first17=I. |last18=de Jong |first18=R. S. |last19=Antoja |first19=T. |last20=Ramos |first20=P. |last21=Steinmetz |first21=M. |last22=Enke |first22=H. |title=Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18 |journal=Astronomy and Astrophysics |date=1 August 2019 |volume=628 |pages=A94 |doi=10.1051/0004-6361/201935765 |arxiv=1904.11302 |bibcode=2019A&A...628A..94A |s2cid=131780028 |issn=0004-6361 |doi-access=free}}</ref>

<ref name = Jayasinghe2018>{{cite journal |last1=Jayasinghe |first1=T |last2=Kochanek |first2=C S |last3=Stanek |first3=K Z |last4=Shappee |first4=B J |last5=Holoien |first5=T W-S |last6=Thompson |first6=Toda A |last7=Prieto |first7=J L |last8=Dong |first8=Subo |last9=Pawlak |first9=M |last10=Shields |first10=J V |last11=Pojmanski |first11=G |last12=Otero |first12=S |last13=Britt |first13=C A |last14=Will |first14=D |title=The ASAS-SN catalogue of variable stars I: The Serendipitous Survey |journal=Monthly Notices of the Royal Astronomical Society |date=1 July 2018 |volume=477 |issue=3 |pages=3145–3163 |doi=10.1093/mnras/sty838 |issn=0035-8711 |bibcode=2018MNRAS.477.3145J |arxiv=1803.01001 |doi-access=free}}</ref>

<ref name = Waston2006>{{cite journal |last1=Watson |first1=C. L. |last2=Henden |first2=A. A. |last3=Price |first3=A. |title=The International Variable Star Index (VSX) |journal=Society for Astronomical Sciences Annual Symposium |date=May 2006 |volume=25 |pages=47 |bibcode=2006SASS...25...47W}}</ref>

}}
{{Volans}}
{{Volans}}
{{DEFAULTSORT:HD 77887}}
{{DEFAULTSORT:HD 77887}}

Revision as of 01:31, 20 March 2022

HD 77887
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Volans
Right ascension 09h 01m 08.5140s[1]
Declination −68° 41′ 02.1096″[1]
Apparent magnitude (V) 5.87 ± 0.01[2]
Characteristics
Evolutionary stage AGB[3]
Spectral type M1 III[4]
U−B color index +1.96[5]
B−V color index +1.63[5]
Variable type Lb[6]
Astrometry
Radial velocity (Rv)12.6 ± 0.4[7] km/s
Proper motion (μ) RA: +16.413[1] mas/yr
Dec.: −0.069[1] mas/yr
Parallax (π)4.2938 ± 0.051 mas[1]
Distance760 ± 9 ly
(233 ± 3 pc)
Absolute magnitude (MV)−0.78[8]
Details[9]
Mass1.12[10] M☉
Radius56.73 R☉
Luminosity598 L☉
Surface gravity (log g)0.9 cgs
Temperature3,820 K
Other designations
45 G. Volantis, NSV 18118, CPD−68°879, GC 12510, HD 77887, HIP 44283, HR 3610, SAO 250421
Database references
SIMBADdata

HD 77887 (HR 3610) is a solitary star located in the southern circumpolar constellation Volans. It has an apparent magnitude of 5.87,[2] making it faintly visible to the naked eye if viewed under ideal conditions. The star is situated at a distance of 760 light years[1] but is recceding with a heliocentric radial velocity of 12.6 km/s.[7]

HD 77887 is an ageing M-type giant[4] that is currently on the asymptotic giant branch.[3] At present it has 1.12[10] times the mass of the Sun but has expanded to 56.73 times its girth.[9] It shines at 598 solar luminosities from its enlarged photosphere at an effective temperature of 3,820 K,[9] which gives it a red glow. HD 77887 is supsected to be a slow irregular variable[6] whose brightness fluctuates at a tenth of a magnitude.[11]

References

  1. ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
  2. ^ a b Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27–L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361.
  3. ^ a b Eggen, Olin J. (July 1992). "Asymptotic giant branch stars near the sun". The Astronomical Journal. 104: 275. Bibcode:1992AJ....104..275E. doi:10.1086/116239. ISSN 0004-6256.
  4. ^ a b Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars. Volume I. Declinations -90_ to -53_ƒ0. Bibcode:1975mcts.book.....H.
  5. ^ a b Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1 January 1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99–110. Bibcode:1966CoLPL...4...99J.
  6. ^ a b Jayasinghe, T; Kochanek, C S; Stanek, K Z; Shappee, B J; Holoien, T W-S; Thompson, Toda A; Prieto, J L; Dong, Subo; Pawlak, M; Shields, J V; Pojmanski, G; Otero, S; Britt, C A; Will, D (1 July 2018). "The ASAS-SN catalogue of variable stars I: The Serendipitous Survey". Monthly Notices of the Royal Astronomical Society. 477 (3): 3145–3163. arXiv:1803.01001. Bibcode:2018MNRAS.477.3145J. doi:10.1093/mnras/sty838. ISSN 0035-8711.
  7. ^ a b Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. ISSN 1063-7737. S2CID 119231169.
  8. ^ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. ISSN 1063-7737.
  9. ^ a b c McDonald, I.; Zijlstra, A. A.; Watson, R. A. (2017). "Fundamental parameters and infrared excesses of Tycho-Gaia stars". Monthly Notices of the Royal Astronomical Society. 471 (1): 770. arXiv:1706.02208. Bibcode:2017MNRAS.471..770M. doi:10.1093/mnras/stx1433.
  10. ^ a b Anders, F.; et al. (1 August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy and Astrophysics. 628: A94. arXiv:1904.11302. Bibcode:2019A&A...628A..94A. doi:10.1051/0004-6361/201935765. ISSN 0004-6361. S2CID 131780028.
  11. ^ Watson, C. L.; Henden, A. A.; Price, A. (May 2006). "The International Variable Star Index (VSX)". Society for Astronomical Sciences Annual Symposium. 25: 47. Bibcode:2006SASS...25...47W.
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