HD 129685

Last updated
c2 Centauri
Observation data
Epoch J2000.0       Equinox J2000.0
Constellation Centaurus [1]
Right ascension 14h 44m 59.20164s [2]
Declination −35° 11′ 30.5833″ [2]
Apparent magnitude  (V)+4.92 [1]
Characteristics
Evolutionary stage main sequence [2]
Spectral type A0IVnn [3] or A0Vn [4]
B−V color index +0.013±0.006 [1]
Astrometry
Radial velocity (Rv)−5.0±2.8 [1] km/s
Proper motion (μ)RA: +9.411 [2] mas/yr
Dec.: −3.426 [2] mas/yr
Parallax (π)14.2784±0.1299  mas [2]
Distance 228 ± 2  ly
(70.0 ± 0.6  pc)
Absolute magnitude  (MV)0.83 [1]
Details
Mass 2.10+0.12
−0.09 [5]   M☉
Radius 2.87 [2]   R☉
Luminosity 44.73 [1]   L☉
Surface gravity (log g)3.80±0.14 [5]   cgs
Temperature 9,323 [6]   K
Rotational velocity (v sin i)455 [7]  km/s
Age 239+143
−144 [5]   Myr
Other designations
c2 Cen, CD−34°9888, GC 19845, HD 129685, HIP 72104, HR 5489, SAO 205899 [8]
Database references
SIMBAD data

HD 129685 is a single [9] 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. [1] 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. [1] The star is drifting closer with a radial velocity of around −5 km/s. [1]

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. [10] The star is radiating 45 times the luminosity of the Sun [1] from its photosphere at an effective temperature of 9,323 K. [6]

References

  1. 1 2 3 4 5 6 7 8 9 10 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. XHIP record for this object at VizieR.
  2. 1 2 3 4 5 6 7 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv: 2208.00211 . Bibcode:2023A&A...674A...1G. doi: 10.1051/0004-6361/202243940 . S2CID   244398875. Gaia DR3 record for this source at VizieR.
  3. 1 2 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. 1 2 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. 1 2 3 4 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. 1 2 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. ↑ Freire Ferrero, R.; Morales Durán, C.; Halbwachs, J. -L.; Cabo Cubeiro, A. M. (2012). "High Ionization Species in the Nearby Interstellar Medium from an Exhaustive Analysis of the IUE INES Database". The Astronomical Journal. 143 (2): 28. Bibcode:2012AJ....143...28F. doi:10.1088/0004-6256/143/2/28.
  8. ↑ "c02 Cen". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2020-03-03.
  9. ↑ 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.
  10. ↑ 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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