| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Centaurus |
| Right ascension | 14 44 59.20177 |
| 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 | |
| c Cen, CD−34°9888, GC 19845, HD 129685, HIP 72104, HR 5489, SAO 205899 | |
| Database references | |
| SIMBAD | data |
HD 129685 is a single star in the southern constellation of Centaurus. It is also known by its Bayer designation c 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. 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. The star is drifting closer with a radial velocity of around −5 km/s.
Two different stellar classifications have been reported for this star. A class of A0Vn assigned by Abt and Morrell (1995) indicates it is a rapidly-rotating A-type main-sequence star, while a type of A0IVnn, 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, and is reported to be rotating close to its break-up velocity. The star is radiating 45 times the luminosity of the Sun from its photosphere at an effective temperature of 9,323 K.
References
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
