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This article is about k Boötis. It is not to be confused with κ (kappa) Boötis.
50 Boötis
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]
Distance275 ± 3  ly
(84.3 ± 0.9  pc)
Absolute magnitude (MV)0.86 [2]
Details
Mass3.31 [4]  M☉
Radius3.1 [5]  R☉
Luminosity55.17 [2]  L☉
Surface gravity (log g)4.35 [4]  cgs
Temperature12,140±413 [4]  K
Rotational velocity (v sin i)232 [4] km/s
Age174 [4]  Myr
Other designations
50 Boo, BD+33°2581, FK5 1395, GC 20672, HD 136849, HIP 75178, HR 5718, SAO 64656 [6]
Database references
SIMBAD data

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]

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

  1. ^ 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.
  2. ^ 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.
  3. ^ 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.
  4. ^ 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.
  5. ^ a b Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics, 367 (2) (Third ed.): 521–524, arXiv: astro-ph/0012289, Bibcode: 2001A&A...367..521P, doi: 10.1051/0004-6361:20000451, S2CID  425754.
  6. ^ a b "50 Boo". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved May 12, 2019.
  7. ^ 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.
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