HD 101570

HD 101570 is a single[6] star in the southern constellation of Centaurus. It has a yellow hue and is faintly visible to the naked eye with an apparent visual magnitude of 4.93.[2] The star is located at a distance of approximately 1,120 light years from the Sun based on parallax, and is drifting further away with a radial velocity of +18 km/s.[1] It has an absolute magnitude of −2.24.[2]

HD 101570
Observation data
Epoch J2000      Equinox J2000
Constellation Centaurus
Right ascension  11h 40m 53.63243s[1]
Declination −62° 05′ 24.3609″[1]
Apparent magnitude (V) 4.93[2]
Characteristics
Spectral type G3Ib[3]
B−V color index 1.111±0.054[2]
Astrometry
Radial velocity (Rv)+18.32±0.39[1] km/s
Proper motion (μ) RA: −14.899±0.289[1] mas/yr
Dec.: +0.681±0.371[1] mas/yr
Parallax (π)2.9079 ± 0.1866[1] mas
Distance1,120 ± 70 ly
(340 ± 20 pc)
Absolute magnitude (MV)−2.24[2]
Details
Radius62.37+4.26
−7.96[1] R☉
Luminosity1,641±120[1] L☉
Temperature4,652+329
−151[1] K
Rotational velocity (v sin i)21.4±2.1[4] km/s
Other designations
CD−61°3145, GC 16037, HD 101570, HIP 56986, HR 4499, SAO 251535[5]
Database references
SIMBADdata

This is an aging supergiant star with a stellar classification of G3Ib.[3] Having exhausted the supply of hydrogen at its core, the star has expanded to 62[1] times the radius of the Sun. It has an abnormally high rate of rotation for its evolutionary state, showing a projected rotational velocity of 21.4 km/s.[7] The star is radiating 1,641 times the luminosity of the Sun from its photosphere at an effective temperature of 4,652 K.[1]

References
  1. 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.
  2. 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.
  3. Houk, Nancy (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.
  4. De Medeiros, J. R.; et al. (November 2002). "A catalog of rotational and radial velocities for evolved stars. II. Ib supergiant stars". Astronomy and Astrophysics. 395: 97–98. Bibcode:2002A&A...395...97D. doi:10.1051/0004-6361:20021214.
  5. "HD 101570". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-08-01.
  6. 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.
  7. Rodrigues da Silva, R.; et al. (March 2015). "On the Nature of Rapidly Rotating Single Evolved Stars". The Astrophysical Journal. 801 (1): 6. arXiv:1503.03447. Bibcode:2015ApJ...801...54R. doi:10.1088/0004-637X/801/1/54. 54.
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