14 Comae Berenices

14 Comae Berenices
Location of 14 Com (circled)
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]
Distance266 ± 5 ly
(82 ± 2 pc)
Absolute magnitude (MV)+0.35[7]
Details[8]
Mass2.4[7] M☉
Radius23 R☉
Luminosity76.01[5] L☉
Surface gravity (log g)3.4[8] cgs
Temperature7,300 K
Rotational velocity (v sin i)226[7] km/s
Age500 Myr
Other designations
14 Com, BD+28°2115, FK5 2997, HD 108283, HIP 60697, HR 4733, SAO 82310[9]
Database references
SIMBADdata

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]

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]

  1. ^ a b c d e f Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference ducati2002 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference Elazm1993 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Belle2012 was invoked but never defined (see the help page).
  5. ^ a b c d Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  7. ^ a b c d Cite error: The named reference pizzolato was invoked but never defined (see the help page).
  8. ^ a b c d e Cite error: The named reference dominy was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference Murphy2015 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference gray2001 was invoked but never defined (see the help page).
  12. ^ a b Cite error: The named reference Abt1999 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Kudryavtsev2006 was invoked but never defined (see the help page).