Astronomy:16 Cephei
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[1] mas |
| Distance | 118.9 ± 0.5 ly (36.5 ± 0.2 pc) |
| Absolute magnitude (MV) | 2.17[6] |
| Details | |
| Mass | 1.38[7] M☉ |
| Radius | 2.77[1] R☉ |
| Luminosity | 11[1] L☉ |
| Surface gravity (log g) | 3.87[4] cgs |
| Temperature | 6,238[4] K |
| Metallicity | −0.36[6] |
| Rotational velocity (v sin i) | 26.4[4] km/s |
| Age | 2[8] Gyr |
| Other designations | |
| 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
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 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.
- ↑ 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.
- ↑ 3.0 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.
- ↑ 4.0 4.1 4.2 4.3 4.4 4.5 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[yes|permanent dead link|dead link}}]
- ↑ 5.0 5.1 Gontcharov, G. A. (November 2006), "Pulkovo Compilation of Radial Velocities for 35495 Hipparcos stars in a common system", Astronomy Letters 32 (11): 759–771, doi:10.1134/S1063773706110065, Bibcode: 2006AstL...32..759G.
- ↑ 6.0 6.1 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.
- ↑ 7.0 7.1 Ligi, R.; Creevey, O.; Mourard, D.; Crida, A.; Lagrange, A. -M.; Nardetto, N.; Perraut, K.; Schultheis, M. et al. (2016). "Radii, masses, and ages of 18 bright stars using interferometry and new estimations of exoplanetary parameters". Astronomy and Astrophysics 586: A94. doi:10.1051/0004-6361/201527054. Bibcode: 2016A&A...586A..94L.
- ↑ 8.0 8.1 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.
- ↑ "16 Cep". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=16+Cep.
- ↑ 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.
- ↑ 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.
- ↑ 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.
- ↑ 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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