  | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Centaurus[1] |
| Right ascension | 11h 34m 45.66s[2] |
| Declination | −54° 15′ 50.7″[2] |
| Apparent magnitude (V) | +4.62[1] |
| Characteristics | |
| Evolutionary stage | Main sequence[3] |
| Spectral type | B9V[4] |
| U−B color index | −0.21[5] |
| B−V color index | −0.08[5] |
| Astrometry | |
| Radial velocity (Rv) | +5.7±2.2[1] km/s |
| Proper motion (μ) | RA: −56.17±0.18[2] mas/yr Dec.: 16.19±0.20[2] mas/yr |
| Parallax (π) | 7.65±0.22 mas[2] |
| Distance | 430 ± 10 ly (131 ± 4 pc) |
| Absolute magnitude (MV) | −0.96[1] |
| Details | |
| Mass | 3.58±0.05[3] M☉ |
| Radius | 4.7[6] R☉ |
| Luminosity | 306[3] L☉ |
| Surface gravity (log g) | 3.54[6] cgs |
| Temperature | 10,600[3] K |
| Metallicity [Fe/H] | 0.50[7] dex |
| Rotation | 0.733[8] days |
| Rotational velocity (v sin i) | 160[3] km/s |
| Age | 238[9] Myr |
| Other designations | |
| A Cen, CPD−53°4637, FK5 2926, GC 15877, HD 100673, HIP 56480, HR 4460, SAO 239189[10] | |
| Database references | |
| SIMBAD | data |
HD 100673, also known as A Centauri is a single[11] star in the southern constellation of Centaurus. It is blue-white in hue and is faintly visible to the naked eye with an apparent visual magnitude of +4.62.[1] The star is located at a distance of approximately 430 light-years from the Sun based on stellar parallax.[2] It appears to be drifting further away with a radial velocity of around +6 km/s.[1]
This is a rapidly rotating Be star, showing an emission-line spectrum on top of the normal absorption spectrum of the star, due to a circumstellar disk of ejected matter. It doesn't show any absorption lines from the disk.[12] It is a B-type main-sequence star with a stellar classification of B9V.[4]
References
- ^ a b c d e f 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 c d e f van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600. Vizier catalog entry
- ^ a b c d e Zorec, J.; Royer, F. (January 2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy & Astrophysics. 537: A120. arXiv:1201.2052. Bibcode:2012A&A...537A.120Z. doi:10.1051/0004-6361/201117691. S2CID 55586789.
- ^ a b Houk, Nancy; Cowley, A. P. (1979). Michigan catalogue of two-dimensional spectral types for the HD stars. Vol. 1. Ann Arbor, Michigan: Department of Astronomy, University of Michigan. Bibcode:1978mcts.book.....H.
- ^ a b Johnson, H. L.; Mitchell, R. I.; Iriarte, B.; Wisniewski, W. Z. (1966). "UBVRIJKL Photometry of the Bright Stars". Communications of the Lunar and Planetary Laboratory. 4: 99. Bibcode:1966CoLPL...4...99J.
- ^ a b Stassun, Keivan G.; et al. (2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467.
- ^ Cardiel, Nicolás; Zamorano, Jaime; Bará, Salvador; Sánchez De Miguel, Alejandro; Cabello, Cristina; Gallego, Jesús; García, Lucía; González, Rafael; Izquierdo, Jaime; Pascual, Sergio; Robles, José; Sánchez, Ainhoa; Tapia, Carlos (2021). "Synthetic RGB photometry of bright stars: Definition of the standard photometric system and UCM library of spectrophotometric spectra". Monthly Notices of the Royal Astronomical Society. 504 (3): 3730. arXiv:2103.17009. Bibcode:2021MNRAS.504.3730C. doi:10.1093/mnras/stab997.
- ^ Balona, Luis A.; Ozuyar, Dogus (2021). "TESS Observations of be Stars: General Characteristics and the Impulsive Magnetic Rotator Model". The Astrophysical Journal. 921 (1): 5. arXiv:2008.06288. Bibcode:2021ApJ...921....5B. doi:10.3847/1538-4357/ac1a77.
- ^ Gontcharov, G. A. (2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters. 38 (12): 771. arXiv:1606.08814. Bibcode:2012AstL...38..771G. doi:10.1134/S1063773712120031.
- ^ "A Cen". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-02-27.
- ^ 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.
- ^ Hanuschik, R. W. (1996). "On the structure of be star disks". Astronomy and Astrophysics. 308: 170. Bibcode:1996A&A...308..170H.
External links
- Wikisky image of HD 100673 (A Centauri)
