50 Boötis
50 Boötis is a single[7] star located 275[1] light years away from the Sun in the northern constellation of Boötes.[6] It is visible to the naked eye as a dim, blue-white hued star with an apparent visual magnitude of 5.38.[2] The object is moving closer to the Earth with a heliocentric radial velocity of −9 km/s.[2]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Boötes |
| Right ascension | 15h 21m 48.57546s[1] |
| Declination | +32° 56′ 01.2942″[1] |
| Apparent magnitude (V) | 5.38[2] |
| Characteristics | |
| Spectral type | B9 Vn[3] |
| B−V color index | −0.051±0.002[2] |
| Astrometry | |
| Radial velocity (Rv) | −9.0±3.5[2] km/s |
| Proper motion (μ) | RA: −48.846[1] mas/yr Dec.: +13.916[1] mas/yr |
| Parallax (π) | 11.8607 ± 0.1288 mas[1] |
| Distance | 275 ± 3 ly (84.3 ± 0.9 pc) |
| Absolute magnitude (MV) | 0.86[2] |
| Details | |
| Mass | 3.31[4] M☉ |
| Radius | 3.1[5] R☉ |
| Luminosity | 55.17[2] L☉ |
| Surface gravity (log g) | 4.35[4] cgs |
| Temperature | 12,140±413[4] K |
| Rotational velocity (v sin i) | 232[4] km/s |
| Age | 174[4] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
This is a B-type main-sequence star with a stellar classification of B9 Vn,[3] where the 'n' notation indicates "nebulous" lines due to rapid rotation. It is 174[4] million years old with a projected rotational velocity of 232[4] km/s. The star has 3.31[4] times the mass of the Sun and about 3.1[5] times the Sun's radius. It is radiating 55[2] times the Sun's luminosity from its photosphere at an effective temperature of 12,140 K.[4]
References Edit
- ^ a b c d e f 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.
- ^ a b c d e f g h 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 Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819.
- ^ a b c d e f g h i David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, S2CID 33401607.
- ^ a b Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics (Third ed.), 367 (2): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
- ^ a b "50 Boo". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved May 12, 2019.
- ^ 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.