K Centauri

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K Centauri
Observation data
Epoch J2000.0       Equinox J2000.0
Constellation Centaurus [1]
Right ascension 13h 29m 25.25471s [2]
Declination −51° 09′ 54.5048″ [2]
Apparent magnitude  (V)+5.04 [1]
Characteristics
Spectral type A1V [3]
U−B color index +0.07
B−V color index +0.059±0.003 [1]
Astrometry
Radial velocity (Rv)−2.0±4.2 [1] km/s
Proper motion (μ)RA: −2.094 [2] mas/yr
Dec.: −5.548 [2] mas/yr
Parallax (π)7.9861±0.2224  mas [2]
Distance 410 ± 10  ly
(125 ± 3  pc)
Absolute magnitude  (MV)−0.91 [1]
Details
Mass 3.128 [4]   M☉
Radius 6.635 [5]   R☉
Luminosity 248 [5]   L☉
Surface gravity (log g)2.982 [5]   cgs
Temperature 9,167 [5]   K
Rotational velocity (v sin i)220.4±2.4 [6]  km/s
Other designations
K Cen, CD−50°7812, GC 18220, HD 117150, HIP 65810, HR 5071, SAO 240883 [7]
Database references
SIMBAD data

K Centauri is a possible binary star in the southern constellation of Centaurus. It has a white hue and is bright enough to be visible to the naked eye, having an apparent visual magnitude of +5.04.

K Centauri is located at a distance of approximately 410  light years from the Sun based on parallax, and it has an absolute magnitude of −0.91. [1] This is an ordinary A-type main-sequence star with a stellar classification of A1V. [3] It is spinning rapidly with a projected rotational velocity of 220 km/s, [6] which is giving it a pronounced equatorial bulge that is 25% larger than the polar radius. [8]

Analysis of Hipparcos and Gaia astrometry suggests that the relatively large margins of error in the calculated parallax may be due to orbital motion caused by an unseen companion. The companion would be an 81  MJ object orbiting at about 2  AU . [4]

References

  1. 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. XHIP record for this object at VizieR.
  2. 1 2 3 4 5 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.
  3. 1 2 Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars, vol. 2, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode:1978mcts.book.....H.
  4. 1 2 Kervella, Pierre; Arenou, Frédéric; Mignard, François; Thévenin, Frédéric (2019), "Stellar and substellar companions of nearby stars from Gaia DR2. Binarity from proper motion anomaly", Astronomy and Astrophysics, 623: A72, arXiv: 1811.08902 , Bibcode:2019A&A...623A..72K, doi:10.1051/0004-6361/201834371, S2CID   119491061.
  5. 1 2 3 4 McDonald, I.; Zijlstra, A. A.; Watson, R. A. (2017), "Fundamental parameters and infrared excesses of Tycho-Gaia stars", Monthly Notices of the Royal Astronomical Society, 471 (1): 770, arXiv: 1706.02208 , Bibcode:2017MNRAS.471..770M, doi: 10.1093/mnras/stx1433 , S2CID   73594365.
  6. 1 2 Díaz, C. G.; et al. (July 2011), "Accurate stellar rotational velocities using the Fourier transform of the cross correlation maximum", Astronomy & Astrophysics, 531: A143, arXiv: 1012.4858 , Bibcode:2011A&A...531A.143D, doi:10.1051/0004-6361/201016386, S2CID   119286673.
  7. ↑ "K Cen". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2020-02-12.
  8. ↑ van Belle, Gerard T. (March 2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review, 20 (1): 51, arXiv: 1204.2572 , Bibcode:2012A&ARv..20...51V, doi:10.1007/s00159-012-0051-2, S2CID   119273474.
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