Astronomy:HD 100673

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Short description: Star in the constellation Centaurus

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HD 100673
Location of A Centauri (circled)
Observation data
Equinox J2000.0]] (ICRS)
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[2] mas
Distance430 ± 10 ly
(131 ± 4 pc)
Absolute magnitude (MV)−0.96[1]
Details
Mass3.58±0.05[3] M☉
Radius4.7[6] R☉
Luminosity306[3] L☉
Surface gravity (log g)3.54[6] cgs
Temperature10,600[3] K
Metallicity [Fe/H]0.50[7] dex
Rotation0.733[8] days
Rotational velocity (v sin i)160[3] km/s
Age238[9] Myr
Other designations
A Cen, CPD−53°4637, FK5 2926, GC 15877, HD 100673, HIP 56480, HR 4460, SAO 239189[10]
Database references
SIMBADdata

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

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 2.5 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V.  Vizier catalog entry
  3. ↑ 3.0 3.1 3.2 3.3 3.4 Zorec, J.; Royer, F. (January 2012). "Rotational velocities of A-type stars. IV. Evolution of rotational velocities". Astronomy & Astrophysics 537: A120. doi:10.1051/0004-6361/201117691. Bibcode: 2012A&A...537A.120Z. 
  4. ↑ 4.0 4.1 Houk, Nancy; Cowley, A. P. (1979). Michigan catalogue of two-dimensional spectral types for the HD stars. 1. Ann Arbor, Michigan: Department of Astronomy, University of Michigan. Bibcode: 1978mcts.book.....H. 
  5. ↑ 5.0 5.1 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. 
  6. ↑ 6.0 6.1 Stassun, Keivan G. et al. (2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal 158 (4): 138. doi:10.3847/1538-3881/ab3467. Bibcode: 2019AJ....158..138S. 
  7. ↑ Cardiel, Nicolás; Zamorano, Jaime; Bará, Salvador; Sánchez De Miguel, Alejandro; Cabello, Cristina; Gallego, Jesús; García, Lucía; González, Rafael et al. (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. doi:10.1093/mnras/stab997. Bibcode: 2021MNRAS.504.3730C. 
  8. ↑ 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. doi:10.3847/1538-4357/ac1a77. Bibcode: 2021ApJ...921....5B. 
  9. ↑ Gontcharov, G. A. (2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters 38 (12): 771. doi:10.1134/S1063773712120031. Bibcode: 2012AstL...38..771G. 
  10. ↑ "A Cen". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=A+Cen. 
  11. ↑ 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. doi:10.1111/j.1365-2966.2008.13596.x. Bibcode: 2008MNRAS.389..869E. 
  12. ↑ 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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