Star in the constellation Aries
20 Arietis is a single star in the northern constellation of Aries . 20 Arietis is the Flamsteed designation . It has an apparent visual magnitude of 5.79, which is bright enough to be just faintly visible to the naked eye as a yellow-white hued star. The star is located approximately 137 light years away from the Sun based upon parallax . It has a relatively high proper motion , traversing the celestial sphere at the rate of 0.188 arc seconds per annum. 20 Arietis is receding from the Earth with a heliocentric radial velocity of +25 km/s.
Gray et al. (2001) gave the stellar classification of 20 Arietis as F6 III-IV, matching an F-type star with spectral traits intermediate between a giant and a subgiant star . Harlan (1969) had found a less-evolved class of F6 IV-V. The star is around two billion years old with an estimated 1.5 times the mass of the Sun and two times the Sun's radius . It is spinning with a projected rotational velocity of 8.0 km/s and has a higher than solar metallicity . The star is radiating 6.6 times the luminosity of the Sun from its photosphere at an effective temperature of around 6,416 K.
References
^ 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 .
^ 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 .
^ 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 .
^ Harlan, E. A. (September 1969), "MK classifications for F- and G-type stars. I", Astronomical Journal , 74 : 916–919, Bibcode :1969AJ.....74..916H , doi :10.1086/110881 .
^ Yee, Samuel W.; et al. (February 2017), "Precision Stellar Characterization of FGKM Stars using an Empirical Spectral Library", The Astrophysical Journal , 836 (1): 17, arXiv :1701.00922 , Bibcode :2017ApJ...836...77Y , doi :10.3847/1538-4357/836/1/77 , S2CID 6302522 , 77.
^ Brewer, John M.; Fischer, Debra A.; Valenti, Jeff A.; Piskunov, Nikolai (2016), "Spectral Properties of Cool Stars: Extended Abundance Analysis of 1,617 Planet-search Stars", The Astrophysical Journal Supplement Series , 225 (2): 32, arXiv :1606.07929 , Bibcode :2016ApJS..225...32B , doi :10.3847/0067-0049/225/2/32 , S2CID 118507965 .
"20 Ari" . SIMBAD Centre de données astronomiques de Strasbourg . Retrieved 17 August 2017.Eggleton, P. P.; Tokovinin, A. A. (2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society , 389 (2): 869, arXiv :0806.2878 , Bibcode :2008MNRAS.389..869E , doi :10.1111/j.1365-2966.2008.13596.x , S2CID 14878976 .
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 .
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