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Chi Centauri (χ Cen, χ Centauri) is a star in the constellation Centaurus.

χ Centauri
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Centaurus
Right ascension 14h 06m 02.77s[1]
Declination −41° 10′ 46.7″[1]
Apparent magnitude (V) +4.353 ± 0.007[2]
Characteristics
Spectral type B2 V[3]
U−B color index −0.774 ± 0.013[2]
B−V color index −0.195 ± 0.006[2]
Variable type β Cep[4]
Astrometry
Radial velocity (Rv)+12 km/s
Proper motion (μ) RA: –22.90 ± 0.17[1] mas/yr
Dec.: –21.69 ± 0.17[1] mas/yr
Parallax (π)6.39 ± 0.21 mas[1]
Distance510 ± 20 ly
(156 ± 5 pc)
Absolute magnitude (MV)−1.3[5]
Details
Mass8.2 ± 0.2[3] M☉
Luminosity1,600[5] L☉
Surface gravity (log g)4.22 ± 0.05[2] cgs
Temperature20,800 ± 300[2] K
Rotational velocity (v sin i)18 ± 1[2] km/s
Age9.1 ± 3.8[3] Myr
Other designations
CD−40°8405, GC 19017, HD 122980, HIP 68862, HR 5285, SAO 224673
Database references
SIMBADdata

χ Centauri is a blue-white B-type main sequence dwarf with a mean apparent magnitude of +4.36. It is approximately 510 light years from Earth. It is classified as a Beta Cephei type variable star and its brightness varies by 0.02 magnitudes with a period of 50.40 minutes.

This star is a proper motion member of the Upper Centaurus–Lupus sub-group in the Scorpius–Centaurus OB association, the nearest such co-moving association of massive stars to the Sun.[5]


References


  1. 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. Nieva, M.-F. (February 2013), "Temperature, gravity, and bolometric correction scales for non-supergiant OB stars", Astronomy & Astrophysics, 550: A26, arXiv:1212.0928, Bibcode:2013A&A...550A..26N, doi:10.1051/0004-6361/201219677, S2CID 119275940.
  3. Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society, 410 (1): 190–200, arXiv:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x, S2CID 118629873
  4. Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/GCVS. Originally Published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
  5. de Geus, E. J.; de Zeeuw, P. T.; Lub, J. (June 1989), "Physical parameters of stars in the Scorpio-Centaurus OB association", Astronomy and Astrophysics, 216 (1–2): 44–61, Bibcode:1989A&A...216...44D


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