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]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Libra |
| Right ascension | 15h 34m 10.70209s[1] |
| Declination | −10° 03′ 52.3063″[1] |
| Apparent magnitude (V) | 4.61[2] |
| Characteristics | |
| Evolutionary stage | subgiant[3] |
| Spectral type | K1III–IV[4] |
| B−V color index | 1.00±0.03[2] |
| Astrometry | |
| Radial velocity (Rv) | +49.25±0.08[5] km/s |
| Proper motion (μ) | RA: +307.63[1] mas/yr Dec.: −234.51[1] mas/yr |
| Parallax (π) | 34.57 ± 0.22 mas[1] |
| Distance | 94.3 ± 0.6 ly (28.9 ± 0.2 pc) |
| Absolute magnitude (MV) | 2.30[2] |
| Details[5] | |
| Mass | 1.38±0.10 M☉ |
| Radius | 5.133±0.043[6] R☉ |
| Luminosity | 12.71±0.69[6] L☉ |
| Surface gravity (log g) | 3.19±0.06 cgs |
| Temperature | 4,809±62[6] K |
| Metallicity [Fe/H] | 0.02±0.04 dex |
| Rotational velocity (v sin i) | 2.02±0.33 km/s |
| Age | 3.39±0.80 Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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
edit- ^ 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