From Wikipedia, the free encyclopedia
16 Cephei
Observation data
Epoch J2000       Equinox J2000
Constellation Cepheus
Right ascension 21h 59m 14.96580s [1]
Declination +73° 10′ 47.6148″ [1]
Apparent magnitude (V) 5.036 [2]
Characteristics
Spectral type F5V [3]
B−V color index 0.41 [4]
Astrometry
Radial velocity (Rv)−20.6±0.4 [5] km/s
Proper motion (μ) RA: −67.590 [1]  mas/ yr
Dec.: −159.571 [1]  mas/ yr
Parallax (π)27.4199 ± 0.1239  mas [1]
Distance118.9 ± 0.5  ly
(36.5 ± 0.2  pc)
Absolute magnitude (MV)2.17 [6]
Details
Mass1.38 [7]  M☉
Radius2.77 [1]  R☉
Luminosity11 [1]  L☉
Surface gravity (log g)3.87 [4]  cgs
Temperature6,238 [4]  K
Metallicity−0.36 [6]
Rotational velocity (v sin i)26.4 [4] km/s
Age2 [8]  Gyr
Other designations
16 Cep, BD+72° 1009, GC 30800, HD 209369, HIP 108535, HR 8400, SAO 10216 [9]
Database references
SIMBAD data

16 Cephei is a single [10] star located about 119  light years away from the Sun in the constellation of Cepheus. It is visible to the naked eye as a faint, yellow-white hued star with an apparent visual magnitude of 5.036. [2] The star has a relatively high proper motion, traversing the celestial sphere at the rate of 0.174  arc seconds per annum. [11] It is moving closer to the Earth with a heliocentric radial velocity of −21 km/s. [5]

This is an ordinary F-type main-sequence star, somewhat hotter than the sun, with a stellar classification of F5 V. [3] It is around two [8] billion years old with a projected rotational velocity of 26.4 km/s. [4] The star has 1.38 [7] times the mass of the Sun and 2.77 [1] times the Sun's radius. It is radiating 11 [1] times the luminosity of the Sun from its photosphere at an effective temperature of 6,238 K. [4] The star is a source of X-ray emission. [12]

There are several 11th and 12th magnitude stars within a few arc-minutes of 16 Cephei, all of them distant background objects. [1] Only one of these is listed in the Washington Double Star Catalog and Catalog of Components of Double and Multiple Stars as a companion. [13]

References

  1. ^ a b c d e f g h i j 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.
  2. ^ a b Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27. Bibcode: 2000A&A...355L..27H.
  3. ^ a b Eggen, O. J. (1962), "Space-velocity vectors for 3483 stars with proper motion and radial velocity", Royal Observatory Bulletin, 51: 79, Bibcode: 1962RGOB...51...79E.
  4. ^ a b c d e f Schröder, C.; Reiners, Ansgar; Schmitt, Jürgen H. M. M. (January 2009), "Ca II HK emission in rapidly rotating stars. Evidence for an onset of the solar-type dynamo" (PDF), Astronomy and Astrophysics, 493 (3): 1099–1107, Bibcode: 2009A&A...493.1099S, doi: 10.1051/0004-6361:200810377[ permanent dead link]
  5. ^ a b Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35495 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.
  6. ^ a b Griffin, R. F.; Suchkov, A. A. (2003). "The Nature of Overluminous F Stars Observed in a Radial-Velocity Survey". The Astrophysical Journal Supplement Series. 147 (1): 103–44. Bibcode: 2003ApJS..147..103G. doi: 10.1086/367855.
  7. ^ a b Ligi, R.; Creevey, O.; Mourard, D.; Crida, A.; Lagrange, A. -M.; Nardetto, N.; Perraut, K.; Schultheis, M.; Tallon-Bosc, I.; Ten Brummelaar, T. (2016). "Radii, masses, and ages of 18 bright stars using interferometry and new estimations of exoplanetary parameters". Astronomy and Astrophysics. 586: A94. arXiv: 1511.03197. Bibcode: 2016A&A...586A..94L. doi: 10.1051/0004-6361/201527054. S2CID  15941645.
  8. ^ a b Casagrande, L.; Schönrich, R.; Asplund, M.; Cassisi, S.; Ramírez, I.; Meléndez, J.; Bensby, T.; Feltzing, S. (2011). "New constraints on the chemical evolution of the solar neighbourhood and Galactic disc(s). Improved astrophysical parameters for the Geneva-Copenhagen Survey". Astronomy and Astrophysics. 530: A138. arXiv: 1103.4651. Bibcode: 2011A&A...530A.138C. doi: 10.1051/0004-6361/201016276. S2CID  56118016.
  9. ^ "16 Cep". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-01-27.
  10. ^ Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv: 0806.2878, Bibcode: 2008MNRAS.389..869E, doi: 10.1111/j.1365-2966.2008.13596.x, S2CID  14878976.
  11. ^ Lépine, Sébastien; Shara, Michael M. (March 2005), "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)", The Astronomical Journal, 129 (3): 1483–1522, arXiv: astro-ph/0412070, Bibcode: 2005AJ....129.1483L, doi: 10.1086/427854, S2CID  2603568.
  12. ^ Haakonsen, Christian Bernt; Rutledge, Robert E. (September 2009), "XID II: Statistical Cross-Association of ROSAT Bright Source Catalog X-ray Sources with 2MASS Point Source Catalog Near-Infrared Sources", The Astrophysical Journal Supplement, 184 (1): 138–151, arXiv: 0910.3229, Bibcode: 2009ApJS..184..138H, doi: 10.1088/0067-0049/184/1/138, S2CID  119267456.
  13. ^ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466. Bibcode: 2001AJ....122.3466M. doi: 10.1086/323920.
Retrieved from " https://en.wikipedia.org/?title=16_Cephei&oldid=1176951778"