  | |
| 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 |
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]
References
- ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv: 1804.09365. Bibcode: 2018A&A...616A...1G. doi: 10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ a b c 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.
- ^ a b c d 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
- ^ a b 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
- ^ a b c d 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.
- ^ 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.
- ^ a b c d 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.
- ^ a b c d e 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.
- ^ "14 Com". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-01-02.
- ^ a b 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
- ^ 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.
- ^ a b 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
- ^ 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.
| |
| 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 |
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]
References
- ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv: 1804.09365. Bibcode: 2018A&A...616A...1G. doi: 10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ a b c 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.
- ^ a b c d 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
- ^ a b 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
- ^ a b c d 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.
- ^ 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.
- ^ a b c d 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.
- ^ a b c d e 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.
- ^ "14 Com". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-01-02.
- ^ a b 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
- ^ 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.
- ^ a b 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
- ^ 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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