14 Comae Berenices

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14 Comae Berenices
Coma Berenices constellation map.svg
Red circle.svg
Location of 14 Com (circled)
Observation data
Epoch J2000       Equinox J2000
Constellation Coma Berenices
Right ascension 12h 26m 24.06442s [1]
Declination +27° 16′ 05.6598″ [1]
Apparent magnitude  (V)4.95 [2]
Characteristics
Evolutionary stage subgiant [1]
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: −15.874 [1] mas/yr
Dec.: −11.784 [1] mas/yr
Parallax (π)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]   M☉
Radius 4.8 [8]   R☉
Luminosity 56 [8]   L☉
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

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]

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]

References

  1. 1 2 3 4 5 6 7 8 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv: 2208.00211 . Bibcode:2023A&A...674A...1G. doi: 10.1051/0004-6361/202243940 . S2CID   244398875. Gaia DR3 record for this source at VizieR.
  2. 1 2 3 Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
  3. 1 2 3 4 Abou Elazm, M. S. (October 1993), "The composite spectrum of the A type star 14 Comae", Astrophysics and Space Science, 208 (1): 1–4, Bibcode:1993Ap&SS.208....1A, doi:10.1007/BF00658127, S2CID   123520053
  4. 1 2 van Belle, Gerard T. (March 2012), "Interferometric observations of rapidly rotating stars", The Astronomy and Astrophysics Review, 20 (1): 51, arXiv: 1204.2572 , Bibcode:2012A&ARv..20...51V, doi:10.1007/s00159-012-0051-2, S2CID   119273474
  5. 1 2 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv: 1108.4971 . Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. S2CID   119257644.
  6. ↑ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv: 1606.08053 . Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID   119231169.
  7. 1 2 3 Pizzolato, N.; et al. (2000). "Evolution of X-ray activity of 1-3 Msun late-type stars in early post-main-sequence phases". Astronomy and Astrophysics. 361: 614. Bibcode:2000A&A...361..614P.
  8. 1 2 3 4 5 6 Stassun, Keivan G.; et al. (2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv: 1905.10694 . Bibcode:2019AJ....158..138S. doi: 10.3847/1538-3881/ab3467 .
  9. ↑ Balona, L. A. (2022). "Rapidly oscillating TESS A-F main-sequence stars: Are the roAp stars a distinct class?". Monthly Notices of the Royal Astronomical Society. 510 (4): 5743. arXiv: 2109.02246 . Bibcode:2022MNRAS.510.5743B. doi: 10.1093/mnras/stac011 .
  10. ↑ "14 Com". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2019-01-02.
  11. ↑ Dominy, J. F.; Smith, M. A. (1977). "A spectroscopic study of 14 Comae and other A-type shell stars". Astrophysical Journal. 217: 494. Bibcode:1977ApJ...217..494D. doi:10.1086/155598.
  12. 1 2 Murphy, Simon J.; et al. (October 2015), "An Evaluation of the Membership Probability of 212 λ Boo Stars. I. A Catalogue", Publications of the Astronomical Society of Australia, 32: 43, arXiv: 1508.03633 , Bibcode:2015PASA...32...36M, doi:10.1017/pasa.2015.34, S2CID   59405545, e036
  13. ↑ Gray, R. O.; et al. (2001). "The Physical Basis of Luminosity Classification in the Late A-, F-, and Early G-Type Stars. I. Precise Spectral Types for 372 Stars". The Astronomical Journal. 121 (4): 2148. Bibcode:2001AJ....121.2148G. doi:10.1086/319956.
  14. 1 2 Abt, Helmut A.; Willmarth, Daryl W. (August 1999), "Binaries in the Praesepe and Coma Star Clusters and Their Implications for Binary Evolution", The Astrophysical Journal, 521 (2): 682–690, Bibcode:1999ApJ...521..682A, doi: 10.1086/307569 , S2CID   119772785
  15. ↑ Kudryavtsev, D. O.; et al. (November 2006). "New magnetic chemically peculiar stars". Monthly Notices of the Royal Astronomical Society. 372 (4): 1804–1828. Bibcode:2006MNRAS.372.1804K. doi: 10.1111/j.1365-2966.2006.10994.x .
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