37 Librae
Star in the constellation Libra
37 Librae is a single[ 8] star in the southern zodiac constellation of Libra . It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.61.[ 2] The star is located 94 light years from the Sun based on parallax , and is drifting further away with a radial velocity of +49 km/s.[ 5]
This is an evolving subgiant star [ 3] with a stellar classification of K1 III–IV,[ 4] where the luminosity class indicates the spectrum displays blended traits of a subgiant and a giant star . It is an estimated 3.4 billion years old with 1.4 times the mass of the Sun .[ 5] Having the supply of hydrogen at its core all but exhausted, the star is starting to expand; currently it has five times the girth of the Sun. It is radiating 12.7 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,809 K.[ 6] At this temperature, 37 Librae glows with the hue of a K-type star .[ 9]
References
^ a b c d e van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics , 474 (2): 653–664, arXiv :0708.1752 , Bibcode :2007A&A...474..653V , doi :10.1051/0004-6361:20078357 , S2CID 18759600 .
^ 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 .
^ a b Snowden, Michael S.; Young, Arthur (March 2005), "Radial Velocities of Late-Type Field Subgiant Stars", The Astrophysical Journal Supplement Series , 157 (1): 126–137, Bibcode :2005ApJS..157..126S , doi :10.1086/423711 .
^ a b Keenan, Philip C.; McNeil, Raymond C. (1989), "The Perkins catalog of revised MK types for the cooler stars", Astrophysical Journal Supplement Series , 71 : 245, Bibcode :1989ApJS...71..245K , doi :10.1086/191373 .
^ a b c d Jofré, E.; et al. (2015), "Stellar parameters and chemical abundances of 223 evolved stars with and without planets", Astronomy & Astrophysics , 574 : A50, arXiv :1410.6422 , Bibcode :2015A&A...574A..50J , doi :10.1051/0004-6361/201424474 , S2CID 53666931 , A50.
^ a b c d Rains, Adam D.; et al. (April 2020). "Precision angular diameters for 16 southern stars with VLTI/PIONIER" . Monthly Notices of the Royal Astronomical Society . 493 (2): 2377–2394. arXiv :2004.02343 . Bibcode :2020MNRAS.493.2377R . doi :10.1093/mnras/staa282 .
^ "37 Lib" . SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2019-07-17 .
^ 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 .
^ "The Colour of Stars" , Australia Telescope, Outreach and Education , Commonwealth Scientific and Industrial Research Organisation, December 21, 2004, archived from the original on 2013-12-03, retrieved 2012-01-16