16 Comae Berenices

16 Comae Berenices is a single[9] star in the northern constellation of Coma Berenices. 16 Comae Berenices is the Flamsteed designation. It is a member of the Coma Star Cluster and is visible to the naked eye with an apparent visual magnitude of 4.96.[2] Based upon an annual parallax shift of 11.7 mas,[1] it is located about 279 light years away.

16 Comae Berenices
Observation data
Epoch J2000      Equinox J2000
Constellation Coma Berenices
Right ascension  12h 26m 59.29615s[1]
Declination +26° 49′ 32.5273″[1]
Apparent magnitude (V) 4.96[2]
Characteristics
Evolutionary stage main sequence[3]
Spectral type A4 V[3]
Astrometry
Radial velocity (Rv)+0.40±0.70[4] km/s
Proper motion (μ) RA: −11.456[1] mas/yr
Dec.: −9.220[1] mas/yr
Parallax (π)11.6745 ± 0.2116[1] mas
Distance279 ± 5 ly
(86 ± 2 pc)
Details[3]
Mass2.54±0.03 M☉
Radius3.71[5] R☉
Luminosity68.6+3.5
−3.3 L☉
Surface gravity (log g)3.67[6] cgs
Temperature8,299+57
−58 K
Metallicity [Fe/H]−0.3[7] dex
Rotational velocity (v sin i)80 km/s
Age310[6] Myr
Other designations
16 Com, BD+27°2134, FK5 2997, HD 108382, HIP 60746, HR 4738, SAO 82314[8]
Database references
SIMBADdata

This is a chemically-peculiar A-type main-sequence star with a stellar classification of A4 V.[3] It displays an infrared excess, suggesting the presence of an orbiting debris disk at a mean distance of 18.2 AU with a temperature of 1870 K.[5] 16 Com has 2.54[3] times the mass of the Sun and 3.71[5] times the Sun's radius. The star is 310[6] million years old with a projected rotational velocity of 80 km/s.[3] It is radiating 67 times the Sun's luminosity from its photosphere at an effective temperature of 8,299 K.[3]

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. Gebran, M.; et al. (February 2008), "Chemical composition of A and F dwarf members of the Coma Berenices open cluster", Astronomy and Astrophysics, 479 (1): 189–206, arXiv:0712.0244, Bibcode:2008A&A...479..189G, doi:10.1051/0004-6361:20078807.
  3. Zorec, J.; et al. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy and Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691.
  4. de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, A61.
  5. Cotten, Tara H.; Song, Inseok (July 2016), "A Comprehensive Census of Nearby Infrared Excess Stars", The Astrophysical Journal Supplement Series, 225 (1): 24, arXiv:1606.01134, Bibcode:2016ApJS..225...15C, doi:10.3847/0067-0049/225/1/15, 15.
  6. David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146.
  7. Gebran, M.; et al. (2016), "A new method for the inversion of atmospheric parameters of A/Am stars", Astronomy & Astrophysics, 589: A83, arXiv:1603.01146, Bibcode:2016A&A...589A..83G, doi:10.1051/0004-6361/201528052.
  8. "16 Com". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-01-05.
  9. 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.
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