Astronomy:16 Cephei

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Short description: Star in the constellation Cepheus
16 Cephei
Observation data
Equinox J2000.0]] (ICRS)
Constellation Cepheus
Right ascension  21h 59m 14.96721s[1]
Declination +73° 10′ 47.6222″[1]
Apparent magnitude (V) 5.036[2]
Characteristics
Evolutionary stage main sequence[1]
Spectral type F5V[3]
B−V color index 0.41[4]
Astrometry
Radial velocity (Rv)−20.17±0.13[1] km/s
Proper motion (μ) RA: −67.994[1] mas/yr
Dec.: −160.076[1] mas/yr
Parallax (π)27.2259 ± 0.0708[1] mas
Distance119.8 ± 0.3 ly
(36.73 ± 0.10 pc)
Absolute magnitude (MV)2.17[5]
Details[6]
Mass1.563±0.061 M☉
Radius2.452±0.067 R☉
Luminosity11.264±0.085 L☉
Surface gravity (log g)3.84±0.05 cgs
Temperature6,754±93 K
Metallicity [Fe/H]−0.24±0.10 dex
Rotational velocity (v sin i)26.4[4] km/s
Age2[7] Gyr
Other designations
16 Cep, BD+72°1009, GC 30800, HD 209369, HIP 108535, HR 8400, SAO 10216[8]
Database references
SIMBADdata

16 Cephei is a single[9] 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.[10] It is moving closer to the Earth with a heliocentric radial velocity of −20 km/s.[1]

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[7] billion years old with a projected rotational velocity of 26.4 km/s.[4] The star has an estimated 1.563 times the mass of the Sun and 2.452 times the Sun's radius. It is radiating 11 times the luminosity of the Sun from its photosphere at an effective temperature of 6,754 K.[6] The star is a source of X-ray emission.[11]

There are several 11th and 12th magnitude stars within a few arc-minutes of 16 Cephei, all of them distant background objects.[12] 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. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  2. ↑ 2.0 2.1 Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P. et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics 355: L27. Bibcode: 2000A&A...355L..27H. 
  3. ↑ 3.0 3.1 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. ↑ 4.0 4.1 4.2 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". Astronomy and Astrophysics 493 (3): 1099–1107. doi:10.1051/0004-6361:200810377. Bibcode: 2009A&A...493.1099S. http://goedoc.uni-goettingen.de/goescholar/bitstream/handle/1/9690/aa10377-08.pdf?sequence=2. Retrieved 2018-11-04. 
  5. ↑ 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. doi:10.1086/367855. Bibcode: 2003ApJS..147..103G. 
  6. ↑ 6.0 6.1 Soubiran, C.; Creevey, O. L.; Lagarde, N.; Brouillet, N.; Jofré, P.; Casamiquela, L.; Heiter, U.; Aguilera-Gómez, C. et al. (2024-02-01). "Gaia FGK benchmark stars: Fundamental Teff and log g of the third version". Astronomy and Astrophysics 682: A145. doi:10.1051/0004-6361/202347136. ISSN 0004-6361. Bibcode: 2024A&A...682A.145S.  16 Cephei database entry at VizieR.
  7. ↑ 7.0 7.1 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. doi:10.1051/0004-6361/201016276. Bibcode: 2011A&A...530A.138C. 
  8. ↑ "16 Cep". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=16+Cep. 
  9. ↑ 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. doi:10.1111/j.1365-2966.2008.13596.x. Bibcode: 2008MNRAS.389..869E. 
  10. ↑ 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. doi:10.1086/427854. Bibcode: 2005AJ....129.1483L. 
  11. ↑ 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. doi:10.1088/0067-0049/184/1/138. Bibcode: 2009ApJS..184..138H. 
  12. ↑ Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  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. doi:10.1086/323920. Bibcode: 2001AJ....122.3466M. 



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