36 Comae Berenices

36 Comae Berenices is a single[6] star in the northern constellation of Coma Berenices. It is faintly visible to the naked eye with an apparent visual magnitude of 4.76.[2] The distance to this star, as determined from an annual parallax shift of 9.3 mas,[1] is 349 light years. It is moving closer to the Earth with a heliocentric radial velocity of −1.5 km/s.[4]

36 Comae Berenices
Observation data
Epoch J2000      Equinox J2000
Constellation Coma Berenices
Right ascension  12h 58m 55.44277s[1]
Declination +17° 24′ 33.9898″[1]
Apparent magnitude (V) 4.76[2]
Characteristics
Evolutionary stage asymptotic giant branch
Spectral type M0.5 III[3]
B−V color index 1.556[4]
Astrometry
Radial velocity (Rv)−1.49±0.27[4] km/s
Proper motion (μ) RA: −37.488[1] mas/yr
Dec.: +33.982[1] mas/yr
Parallax (π)9.3472 ± 0.2157[1] mas
Distance349 ± 8 ly
(107 ± 2 pc)
Absolute magnitude (MV)−0.22[2]
Details[4]
Radius43 R☉
Luminosity372 L☉
Surface gravity (log g)1.0 cgs
Temperature3,890±20 K
Rotational velocity (v sin i)5.8 km/s
Other designations
36 Com, BD+18°2682, FK5 3036, HD 112769, HIP 63355, HR 4920, SAO 100357[5]
Database references
SIMBADdata

This is an evolved red giant star with a stellar classification of M0.5 III,[3] currently on the asymptotic giant branch of the Hertzsprung–Russell diagram.[7] This indicates it has consumed the hydrogen at its center and is now generating energy through hydrogen and helium fusion along shells surrounding an inert carbon and oxygen core. It has expanded to 43 times the radius of the Sun and is radiating 372 times the Sun's luminosity from its photosphere at an effective temperature of 3,890 K.[4]

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. Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series, 71: 245, Bibcode:1989ApJS...71..245K, doi:10.1086/191373.
  4. Massarotti, Alessandro; et al. (January 2008), "Rotational and Radial Velocities for a Sample of 761 HIPPARCOS Giants and the Role of Binarity", The Astronomical Journal, 135 (1): 209–231, Bibcode:2008AJ....135..209M, doi:10.1088/0004-6256/135/1/209.
  5. "36 Com". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-01-06.
  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. Eggen, O. J. (1992), "Asymptotic giant branch stars near the sun", The Astronomical Journal, 104: 275, Bibcode:1992AJ....104..275E, doi:10.1086/116239.
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