Not to be confused with Alpha Centauri. For a Centauri, see HD 125823.
HD 100673
Diagram showing star positions and boundaries of the Centaurus constellation and its surroundings
Location of A Centauri (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Centaurus
Right ascension 11h 34m 45.66s[1]
Declination −54° 15′ 50.7″[1]
Apparent magnitude (V) +4.62[2]
Characteristics
Evolutionary stage Main sequence[3]
Spectral type B9V[4]
U−B color index −0.21
B−V color index −0.077±0.005[2]
Astrometry
Radial velocity (Rv)+5.7±2.2[2] km/s
Proper motion (μ) RA: −56.17±0.18[1] mas/yr
Dec.: 16.19±0.20[1] mas/yr
Parallax (π)7.65 ± 0.22 mas[1]
Distance430 ± 10 ly
(131 ± 4 pc)
Absolute magnitude (MV)−0.96[2]
Details
Mass3.58±0.05[3] M☉
Radius2.4–3.1[5] R☉
Luminosity306[3] L☉
Temperature10,600[3] K
Rotational velocity (v sin i)160[3] km/s
Other designations
A Cen, CPD−53°4637, FK5 2926, GC 15877, HD 100673, HIP 56480, HR 4460, SAO 239189[6]
Database references
SIMBADdata

A Centauri is a single[7] 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.[2] The star is located at a distance of approximately 430 light-years from the Sun based on stellar parallax.[1] It appears to be drifting further away with a radial velocity of around +6 km/s.[2]

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.[8] It is a B-type main-sequence star with a stellar classification of B9V.[4]

References

  1. 1 2 3 4 5 6 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
  2. 1 2 3 4 5 6 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. 1 2 3 4 5 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.
  4. 1 2 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.
  5. ↑ Pasinetti Fracassini, L. E.; et al. (2001). "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)". Astronomy & Astrophysics (Third ed.). 367 (2): 521–24. arXiv:astro-ph/0012289. Bibcode:2001A&A...367..521P. doi:10.1051/0004-6361:20000451. S2CID 425754.
  6. ↑ "A Cen". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-02-27.
  7. ↑ 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.
  8. ↑ Hanuschik, R. W. (1996). "On the structure of be star disks". Astronomy and Astrophysics. 308: 170. Bibcode:1996A&A...308..170H.
  • Wikisky image of HD 100673 (A Centauri)
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