HD 129685: Difference between revisions

c² Centauri
Observation data; Epoch J2000.0 Equinox J2000.0
Constellation	Centaurus
Right ascension	14h 44m 59.20177s
Declination	−35° 11′ 30.5750″
Apparent magnitude (V)	+4.92
Characteristics
Spectral type	A0IVnn or A0Vn
B−V color index	+0.013±0.006
Astrometry
Radial velocity (Rv)	−5.0±2.8 km/s
Proper motion (μ)	RA: 9.255 mas/yr ; Dec.: −3.943 mas/yr
Parallax (π)	14.1199 ± 0.2091 mas
Distance	231 ± 3 ly ; (71 ± 1 pc)
Absolute magnitude (MV)	0.83
Details
Mass	2.10+0.12; −0.09 M☉
Luminosity	44.73 L☉
Surface gravity (log g)	3.80±0.14 cgs
Temperature	9,323 K
Age	239+143; −144 Myr
Other designations
	c2 Cen, CD−34°9888, GC 19845, HD 129685, HIP 72104, HR 5489, SAO 205899
Database references
SIMBAD	data

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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

^ ^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.
^ ^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.
^ ^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.
^ ^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.
^ ^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.
^ ^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.
^ "c02 Cen". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-03-03.
^ 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.
^ 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.

[GaiaDR2-1] 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.

[Anderson2012-2] ^ ^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.

[Gray1987-3] 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.

[Abt1995-4] 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.

[gullikson2016-5] 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.

[diBenedetto1998-6] 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.

[SIMBAD-7] "c02 Cen". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-03-03.

[Eggleton2008-8] 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.

[Molaro1984-9] 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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@@ Line 1: / Line 1: @@
+{{Short description|Star in the constellation Centaurus}}
-{{about|c<sup>2</sup> Centauri|C<sup>2</sup> Centauri|C2 Centauri|other stars with this [[Bayer designation]]|C Centauri}}
+{{about|c<sup>2</sup> Centauri|C<sup>2</sup> Centauri|HD 100825|other stars with this [[Bayer designation]]|C Centauri}}
 {{Starbox begin
-| name = c² Centauri
+ | name = c<sup>2</sup> Centauri
 }}
 {{Starbox observe
-| epoch= J2000.0
+ | epoch       = J2000.0
-| constell = [[Centaurus]]
+ | constell    = [[Centaurus]]
-| ra = {{RA|14|44|59.20}}<ref name="van Leeuwen2007"/>
+ | ra          = {{RA|14|44|59.20177}}<ref name=GaiaDR2/>
-| dec = {{DEC|−35|11|30.6}}<ref name="van Leeuwen2007"/>
+ | dec         = {{DEC|−35|11|30.5750}}<ref name=GaiaDR2/>
-| appmag_v = +4.92
+ | appmag_v    = +4.92<ref name=Anderson2012/>
 }}
 {{Starbox character
-| class = A0V
+ | type        =
+ | 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
-| variable = none
+ | u-b         =
+ | variable    =
 }}
 {{Starbox astrometry
-| radial_v = −5
+ | radial_v    = {{Val|−5.0|2.8}}<ref name=Anderson2012/>
-| prop_mo_ra = 9.17 ± 0.20<ref name="van Leeuwen2007"/>
+ | prop_mo_ra  = 9.255<ref name=GaiaDR2/>
-| prop_mo_dec = -2.30 ± 0.20<ref name="van Leeuwen2007"/>
+ | prop_mo_dec = −3.943<ref name=GaiaDR2/>
-| parallax = 15.22
+ | parallax    = 14.1199
-| p_error = 0.22
+ | p_error     = 0.2091
-| parallax_footnote = <ref name="van Leeuwen2007"/>
+ | parallax_footnote = <ref name=GaiaDR2/>
-| absmag_v = +0.91
+ | absmag_v    = 0.83<ref name=Anderson2012/>
+}}
+{{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
-| names = [[Harvard Revised catalogue|HR]]&nbsp;5489, [[Henry Draper Catalogue|HD]]&nbsp;129685, [[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
-| Simbad = HD+129685
+ | Simbad = HD+129685
 }}
 {{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 214 [[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/>
+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/>
 ==References==
 {{Reflist|colwidth=30em|refs=
+<ref name=GaiaDR2>{{cite DR2|6203042324394718976}}</ref>
-<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 | year=2007 | arxiv=0708.1752 | bibcode=2007A&A...474..653V | doi=10.1051/0004-6361:20078357 }} [http://webviz.u-strasbg.fr/viz-bin/VizieR-5?-out.add=.&-source=I/311/hip2&recno=71862 Vizier catalog entry ]</ref>
+<ref name=SIMBAD>{{cite simbad | title=c02 Cen | access-date=2020-03-03}}</ref>
+<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>
 }}
@@ Line 43: / Line 118: @@
 {{DEFAULTSORT:Hd 129685}}
-[[Category:Bayer objects|Centauri, c2]]
-[[Category:Centaurus (constellation)]]
 [[Category:A-type main-sequence stars]]
+[[Category:Centaurus]]
+[[Category:Bayer objects|Centauri, c2]]
+[[Category:Durchmusterung objects]]
 [[Category:Henry Draper Catalogue objects|129685]]
-[[Category:HR objects|5489]]
+[[Category:Hipparcos objects|072104]]
+[[Category:Bright Star Catalogue objects|5489]]
+[[Category:A-type subgiants]]
-{{Main-star-stub}}

Observation data Epoch J2000.0 Equinox J2000.0
Constellation	Centaurus
Right ascension	14^h 44^m 59.20177^s^[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 (R_v)	−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]
Distance	231 ± 3 ly (71 ± 1 pc)
Absolute magnitude (M_V)	0.83^[2]

Details

Mass	2.10+0.12 −0.09^[5] `M`_☉
Luminosity	44.73^[2] `L`_☉
Surface gravity (log g)	3.80±0.14^[5] cgs
Temperature	9,323^[6] K
Age	239+143 −144^[5] Myr

Other designations
c² Cen, CD−34°9888, GC 19845, HD 129685, HIP 72104, HR 5489, SAO 205899^[7]
Database references
SIMBAD	data