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Star in the constellation Coma Berenices From Wikipedia, the free encyclopedia
14 Comae Berenices is a single[3] star in the northern constellation of Coma Berenices, and is the second brightest[8] member of the Coma Star Cluster.[3] It is a faint star but visible to the naked eye with an apparent visual magnitude of 4.95.[2] Parallax measurements place the star at a distance of about 266 light years.[1]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Coma Berenices |
Right ascension | 12h 26m 24.06461s[1] |
Declination | +27° 16′ 05.6845″[1] |
Apparent magnitude (V) | 4.95[2] |
Characteristics | |
Spectral type | F0p[3][4] |
U−B color index | +0.18[2] |
B−V color index | +0.277±0.018[5] |
Astrometry | |
Radial velocity (Rv) | −2.20[6] km/s |
Proper motion (μ) | RA: −16.010[1] mas/yr Dec.: −13.412[1] mas/yr |
Parallax (π) | 12.2564 ± 0.2329 mas[1] |
Distance | 266 ± 5 ly (82 ± 2 pc) |
Absolute magnitude (MV) | +0.35[7] |
Details[8] | |
Mass | 2.4[7] M☉ |
Radius | 23 R☉ |
Luminosity | 76.01[5] L☉ |
Surface gravity (log g) | 3.4[8] cgs |
Temperature | 7,300 K |
Rotational velocity (v sin i) | 226[7] km/s |
Age | 500 Myr |
Other designations | |
Database references | |
SIMBAD | data |
The spectrum of this star is peculiar and it has been assigned a number of different stellar classifications: A5, F0p, F0 III Sr, F0 vp,[3] F1 IV: np Sr shell,[5] A9 IV np Sr II,[10] F1 IV,[11] and A9 V + shell.[12] Abt & Morrell (1995) designated this a Lambda Boötis star but this was later refuted.[10] No surface magnetic field has been detected on 14 Comae Bernices.[13]
14 Comae Berenices is a well-known[12][8] shell star with a high rate of spin, showing a projected rotational velocity of 226 km/s.[7] This is giving the star an oblate shape with an equatorial bulge that is 12% larger than the polar radius.[4] It is radiating 76[5] times the Sun's luminosity from its photosphere at an effective temperature of 7,300 K.[8]
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