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{{Short description|Star in the constellation Centaurus}}
{{Unreferenced stub|auto=yes|date=December 2009}}
{{about|c<sup>2</sup> Centauri|C<sup>2</sup> Centauri|HD 100825|other stars with this [[Bayer designation]]|C Centauri}}
{{Starbox begin |
{{Starbox begin
| name=c² Centauri
| name = c<sup>2</sup> Centauri
}}
}}
{{Starbox observe
{{Starbox observe
| epoch=[[J2000.0]]
| epoch = J2000.0
| constell=[[Centaurus]]
| constell = [[Centaurus]]
| ra = {{RA|14|44|59.20177}}<ref name=GaiaDR2/>
| ra=14<sup>h</sup>44<sup>m</sup>59.2<sup>s</sup>
| dec = {{DEC|−35|11|30.5750}}<ref name=GaiaDR2/>
| dec=−35°11′31″
| appmag_v=+4.92
| appmag_v = +4.92<ref name=Anderson2012/>
}}
}}
{{Starbox character
{{Starbox character
| type =
| class=A0V
| class = A0IVnn<ref name=Gray1987/> or A0Vn<ref name=Abt1995/>
| b-v=+0.01
| b-v = {{Val|+0.013|0.006}}<ref name=Anderson2012/>
| u-b=−0.03
| u-b =
| variable=none
| variable =
}}
}}
{{Starbox astrometry
{{Starbox astrometry
| radial_v=−5
| radial_v = {{Val|−5.0|2.8}}<ref name=Anderson2012/>
| prop_mo_ra=10.04
| prop_mo_ra = 9.255<ref name=GaiaDR2/>
| prop_mo_dec=−2.03
| prop_mo_dec = −3.943<ref name=GaiaDR2/>
| parallax = 14.1199
| absmag_v=+0.91
| p_error = 0.2091
| parallax=15.76
| parallax_footnote = <ref name=GaiaDR2/>
| p_error=0.74
| absmag_v = 0.83<ref name=Anderson2012/>
| dist_ly=207.0
}}
| dist_pc=63.5
{{Starbox detail
| mass = {{Val|2.10|0.12|0.09}}<ref name=gullikson2016/>
| radius =
| luminosity = 44.73<ref name=Anderson2012/>
| temperature = 9,323<ref name=diBenedetto1998/>
| metal_fe =
| gravity = {{Val|3.80|0.14}}<ref name=gullikson2016/>
| rotational_velocity =
| age_myr = {{Val|239|143|144}}<ref name=gullikson2016/>
}}
}}
{{Starbox catalog
{{Starbox catalog
| names=[[Harvard Revised catalogue|HR]]&nbsp;5489, [[Henry Draper Catalogue|HD]]&nbsp;129685, [[Cordoba Durchmusterung|CD]]−34°9888, [[Hipparcos catalogue|HIP]]&nbsp;72104, [[Smithsonian Astrophysical Observatory catalogue|SAO]]&nbsp;205899, GC&nbsp;19845}}
| names = {{odlist | B=c<sup>2</sup>&nbsp;Cen | CD=−34°9888 | HD=129685 | HIP=72104 | HR=5489 | SAO=205899 | GC=19845 }}<ref name=SIMBAD/>
}}
{{Starbox reference
{{Starbox reference
| Simbad=HD+129685
| Simbad = HD+129685
}}
}}
{{Starbox end}}
{{Starbox end}}
'''HD 129685''', also known by its [[Bayer designation]] '''c² Centauri''' (c² Cen), is a [[star]] in the [[constellation]] [[Centaurus]]. c² Centauri is a white [[stellar classification|A-type]] [[main sequence|main sequence dwarf]] with an [[apparent magnitude]] of +4.92. It is approximately 207.0 [[light years]] from [[Earth]].


'''HD 129685''' is a single<ref name=Eggleton2008/> [[star]] in the southern [[constellation]] of [[Centaurus]]. It is also known by its [[Bayer designation]] '''c<sup>2</sup> Centauri''', while ''HD 129685'' is the star's identifier in the ''[[Henry Draper catalogue]]''. This object has a white hue and is faintly visible to the naked eye with an [[apparent visual magnitude]] of +4.92.<ref name=Anderson2012/> It is located at a distance of approximately 231&nbsp;[[light year]]s from the [[Sun]] based on [[stellar parallax|parallax]], and it has an [[absolute magnitude]] of 0.83.<ref name=Anderson2012/> The star is drifting closer with a [[radial velocity]] of around −5&nbsp;km/s.<ref name=Anderson2012/>
{{Stars of Centaurus}}


Two different [[stellar classification]]s have been reported for this star. A class of A0Vn<ref name=Abt1995/> assigned by Abt and Morrell (1995) indicates it is a rapidly-rotating [[A-type main-sequence star]], while a type of A0IVnn,<ref name=Gray1987/> according to Gray and Garrison (1987), suggests it is a somewhat more [[stellar evolution|evolved]] [[subgiant star]]. It is around 239&nbsp;million years old with 2.1 times the [[mass of the Sun]],<ref name=gullikson2016/> and is reported to be rotating close to its break-up velocity.<ref name=Molaro1984/> The star is radiating 45<ref name=Anderson2012/> times the [[luminosity of the Sun]] from its [[photosphere]] at an [[effective temperature]] of 9,323&nbsp;K.<ref name=diBenedetto1998/>
{{DEFAULTSORT:Hd 129685}}
[[Category:Bayer objects|Centauri, c²]]
[[Category:Centaurus constellation]]
[[Category:A-type main sequence stars]]
[[Category:Henry Draper Catalogue objects|129685]]


==References==
{{Reflist|colwidth=30em|refs=


<ref name=GaiaDR2>{{cite DR2|6203042324394718976}}</ref>
{{Main-star-stub}}


<ref name=SIMBAD>{{cite simbad | title=c02 Cen | access-date=2020-03-03}}</ref>
[[fa:اچ‌دی ۱۲۹۶۸۵]]

<ref name=Anderson2012>{{citation
| title=XHIP: An extended hipparcos compilation
| last1=Anderson | first1=E. | last2=Francis | first2=Ch.
| journal=Astronomy Letters | arxiv=1108.4971
| volume=38 | issue=5 | pages=331 | year=2012
| bibcode=2012AstL...38..331A | postscript=.
| doi=10.1134/S1063773712050015 | s2cid=119257644 }}</ref>

<ref name=Eggleton2008>{{citation
| 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
| bibcode=2008MNRAS.389..869E | arxiv=0806.2878
| doi=10.1111/j.1365-2966.2008.13596.x | doi-access=free | s2cid=14878976 | postscript=. }}</ref>

<ref name=diBenedetto1998>{{citation
| last1=di Benedetto | first1=G. P.
| title=Towards a fundamental calibration of stellar parameters of A, F, G, K dwarfs and giants
| journal=Astronomy and Astrophysics
| volume=339 | pages=858–871 | date=November 1998
| bibcode=1998A&A...339..858D | postscript=. }}</ref>

<ref name=gullikson2016>{{citation
| last1=Gullikson | first1=Kevin
| last2=Kraus | first2=Adam | last3=Dodson-Robinson | first3=Sarah
| title=The Close Companion Mass-ratio Distribution of Intermediate-mass Stars
| journal=The Astronomical Journal
| volume=152 | issue=2 | pages=40 | year=2016
| bibcode=2016AJ....152...40G | postscript=.
| arxiv=1604.06456 | doi=10.3847/0004-6256/152/2/40| s2cid=119179065
| doi-access=free
}}</ref>

<ref name=Gray1987>{{citation
| title=The Early A-Type Stars: Refined MK Classification, Confrontation with Stroemgren Photometry, and the Effects of Rotation
| last1=Gray | first1=R. O. | last2=Garrison | first2=R. F.
| journal=Astrophysical Journal Supplement | postscript=.
| volume=65 | page=581 | date=December 1987
| doi=10.1086/191237 | bibcode=1987ApJS...65..581G | doi-access=free }}</ref>

<ref name=Abt1995>{{citation
| last1=Abt | first1=Helmut A.
| last2=Morrell | first2=Nidia I.
| title=The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars
| journal=Astrophysical Journal Supplement
| volume=99 | page=135 | date=July 1995 | postscript=.
| doi=10.1086/192182 | bibcode=1995ApJS...99..135A | doi-access=free }}</ref>

<ref name=Molaro1984>{{citation
| title=IUE spectra of three A0 V stars rotating close to their break-up velocity: HD 119921, HD 129685, HD 181296
| last1=Molaro | first1=P. | last2=Morossi | first2=C.
| last3=Ramella | first3=M. | last4=Franco | first4=M.
| journal=ESA Fourth European IUE Conf
| pages=223–225 | date=July 1984
| volume=218 | bibcode=1984ESASP.218..223M | postscript=. }}</ref>

}}

{{Stars of Centaurus}}

{{DEFAULTSORT:Hd 129685}}
[[Category:A-type main-sequence stars]]
[[Category:Centaurus]]
[[Category:Bayer objects|Centauri, c2]]
[[Category:Durchmusterung objects]]
[[Category:Henry Draper Catalogue objects|129685]]
[[Category:Hipparcos objects|072104]]
[[Category:Bright Star Catalogue objects|5489]]
[[Category:A-type subgiants]]

Latest revision as of 02:21, 23 August 2024

This article is about c2 Centauri. For C2 Centauri, see HD 100825. For other stars with this Bayer designation, see C Centauri.
c2 Centauri
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Centaurus
Right ascension 14h 44m 59.20177s[1]
Declination −35° 11′ 30.5750″[1]
Apparent magnitude (V) +4.92[2]
Characteristics
Spectral type A0IVnn[3] or A0Vn[4]
B−V color index +0.013±0.006[2]
Astrometry
Radial velocity (Rv)−5.0±2.8[2] km/s
Proper motion (μ) RA: 9.255[1] mas/yr
Dec.: −3.943[1] mas/yr
Parallax (π)14.1199 ± 0.2091 mas[1]
Distance231 ± 3 ly
(71 ± 1 pc)
Absolute magnitude (MV)0.83[2]
Details
Mass2.10+0.12
−0.09[5] M☉
Luminosity44.73[2] L☉
Surface gravity (log g)3.80±0.14[5] cgs
Temperature9,323[6] K
Age239+143
−144[5] Myr
Other designations
c2 Cen, CD−34°9888, GC 19845, HD 129685, HIP 72104, HR 5489, SAO 205899[7]
Database references
SIMBADdata

HD 129685 is a single[8] star in the southern constellation of Centaurus. It is also known by its Bayer designation c2 Centauri, while HD 129685 is the star's identifier in the Henry Draper catalogue. This object has a white hue and is faintly visible to the naked eye with an apparent visual magnitude of +4.92.[2] It is located at a distance of approximately 231 light years from the Sun based on parallax, and it has an absolute magnitude of 0.83.[2] The star is drifting closer with a radial velocity of around −5 km/s.[2]

Two different stellar classifications have been reported for this star. A class of A0Vn[4] assigned by Abt and Morrell (1995) indicates it is a rapidly-rotating A-type main-sequence star, while a type of A0IVnn,[3] according to Gray and Garrison (1987), suggests it is a somewhat more evolved subgiant star. It is around 239 million years old with 2.1 times the mass of the Sun,[5] and is reported to be rotating close to its break-up velocity.[9] The star is radiating 45[2] times the luminosity of the Sun from its photosphere at an effective temperature of 9,323 K.[6]

References

[edit]
  1. ^ a b c d e Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. ^ a b c d e f g h i 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, S2CID 119257644.
  3. ^ a b Gray, R. O.; Garrison, R. F. (December 1987), "The Early A-Type Stars: Refined MK Classification, Confrontation with Stroemgren Photometry, and the Effects of Rotation", Astrophysical Journal Supplement, 65: 581, Bibcode:1987ApJS...65..581G, doi:10.1086/191237.
  4. ^ a b Abt, Helmut A.; Morrell, Nidia I. (July 1995), "The Relation between Rotational Velocities and Spectral Peculiarities among A-Type Stars", Astrophysical Journal Supplement, 99: 135, Bibcode:1995ApJS...99..135A, doi:10.1086/192182.
  5. ^ a b c d Gullikson, Kevin; Kraus, Adam; Dodson-Robinson, Sarah (2016), "The Close Companion Mass-ratio Distribution of Intermediate-mass Stars", The Astronomical Journal, 152 (2): 40, arXiv:1604.06456, Bibcode:2016AJ....152...40G, doi:10.3847/0004-6256/152/2/40, S2CID 119179065.
  6. ^ a b di Benedetto, G. P. (November 1998), "Towards a fundamental calibration of stellar parameters of A, F, G, K dwarfs and giants", Astronomy and Astrophysics, 339: 858–871, Bibcode:1998A&A...339..858D.
  7. ^ "c02 Cen". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-03-03.
  8. ^ 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, S2CID 14878976.
  9. ^ Molaro, P.; Morossi, C.; Ramella, M.; Franco, M. (July 1984), "IUE spectra of three A0 V stars rotating close to their break-up velocity: HD 119921, HD 129685, HD 181296", ESA Fourth European IUE Conf, 218: 223–225, Bibcode:1984ESASP.218..223M.
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