Astronomy:16 Comae Berenices
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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 |
| Distance | 279 ± 5 ly (86 ± 2 pc) |
| Details[3] | |
| Mass | 2.54±0.03 M☉ |
| Radius | 3.71[5] R☉ |
| Luminosity | 68.6+3.5 −3.3 L☉ |
| Surface gravity (log g) | 3.67[6] cgs |
| Temperature | 8,299+57 −58 K |
| Metallicity [Fe/H] | −0.3[7] dex |
| Rotational velocity (v sin i) | 80 km/s |
| Age | 310[6] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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.
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 astronomical unit|AU with a temperature of 180 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
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 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, doi:10.1051/0004-6361:20078807, Bibcode: 2008A&A...479..189G.
- ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 Zorec, J. et al. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy and Astrophysics 537: A120, doi:10.1051/0004-6361/201117691, Bibcode: 2012A&A...537A.120Z.
- ↑ 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, doi:10.1051/0004-6361/201219219, A61, Bibcode: 2012A&A...546A..61D.
- ↑ 5.0 5.1 5.2 Cotten, Tara H.; Song, Inseok (July 2016), "A Comprehensive Census of Nearby Infrared Excess Stars", The Astrophysical Journal Supplement Series 225 (1): 24, doi:10.3847/0067-0049/225/1/15, 15, Bibcode: 2016ApJS..225...15C.
- ↑ 6.0 6.1 6.2 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, doi:10.1088/0004-637X/804/2/146, Bibcode: 2015ApJ...804..146D.
- ↑ Gebran, M. et al. (2016), "A new method for the inversion of atmospheric parameters of A/Am stars", Astronomy & Astrophysics 589: A83, doi:10.1051/0004-6361/201528052, Bibcode: 2016A&A...589A..83G.
- ↑ "16 Com". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=16+Com.
- ↑ 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, doi:10.1111/j.1365-2966.2008.13596.x, Bibcode: 2008MNRAS.389..869E.
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