14 Comae Berenices
Star in the constellation Coma Berenices
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14 Comae Berenices is a single[3] star in the northern constellation of Coma Berenices, and is the second brightest[11] 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 289 light years.[1]
 | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Coma Berenices |
| Right ascension | 12h 26m 24.06442s[1] |
| Declination | +27° 16â² 05.6598â³[1] |
| Apparent magnitude (V) | 4.95[2] |
| Characteristics | |
| Evolutionary stage | subgiant[1] |
| Spectral type | F0p[3][4] |
| UâB color index | +0.18[2] |
| BâV color index | +0.277±0.018[5] |
| Astrometry | |
| Radial velocity (Rv) | â2.20[6] km/s |
| Proper motion (μ) | RA: â15.874[1] mas/yr Dec.: â11.784[1] mas/yr |
| Parallax (Ï) | 11.2826±0.1085 mas[1] |
| Distance | 289 ± 3 ly (88.6 ± 0.9 pc) |
| Absolute magnitude (MV) | +0.35[7] |
| Details | |
| Mass | 1.6[8] Mâ |
| Radius | 4.8[8] Râ |
| Luminosity | 56[8] Lâ |
| Surface gravity (log g) | 3.27[8] cgs |
| Temperature | 7,170[8] K |
| Rotation | 1.272 days[9] |
| Rotational velocity (v sin i) | 226[7] km/s |
| Age | 500[1] Myr |
| Other designations | |
| 14 Com, AAVSO 1221+27, BD+28°2115, FK5 2997, HD 108283, HIP 60697, HR 4733, SAO 82310[10] | |
| 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,[12] F1 IV,[13] and A9 V + shell.[14] Abt & Morrell (1995) designated this a Lambda Boötis star but this was later refuted.[12] No surface magnetic field has been detected on 14 Comae Berenices.[15]
14 Comae Berenices is a well-known[14] 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 56 times the Sun's luminosity from its photosphere at an effective temperature of 7,170 K.[8]