HD 173936

HD 173936 is a star in the northern constellation of Lyra. It has a blue-white hue and is just barely visible to the naked eye with an apparent visual magnitude of 6.06.[2] Based upon parallax measurements, the star is located at a distance of approximately 900 light years from the Sun,[1] and has an absolute magnitude of −1.14.[2] It is drifting closer with a radial velocity of −19 km/s.[2]

HD 173936
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Lyra
Right ascension 18h 46m 13.01070s[1]
Declination +41° 26′ 30.5041″[1]
Apparent magnitude (V) 6.06[2]
Characteristics
Evolutionary stage Main sequence[3]
Spectral type B6 V[4]
B−V color index −0.120±0.005[2]
Astrometry
Radial velocity (Rv)−19.1±2.9[2] km/s
Proper motion (μ) RA: −1.441[1] mas/yr
Dec.: +0.858[1] mas/yr
Parallax (π)3.6200 ± 0.0622 mas[1]
Distance900 ± 20 ly
(276 ± 5 pc)
Absolute magnitude (MV)−1.14[2]
Details
Mass4.59±0.23[3] M☉
Luminosity701+194
−151[3] L☉
Surface gravity (log g)3.81±0.08[5] cgs
Temperature13,932±96[3] K
Metallicity [Fe/H]−0.04±0.08[5] dex
Rotational velocity (v sin i)116±8[6] km/s
Age22.4[7] Gyr
Other designations
BD+41°3137, FK5 3493, GC 25732, HD 173936, HIP 92098, HR 7073, SAO 47779[8]
Database references
SIMBADdata

This object is a B-type main-sequence star with a stellar classification of B6 V.[4] It is around 22.4[7] million years old with 4.6[3] times the mass of the Sun and has a high rate of spin, showing a projected rotational velocity of 116 km/s.[6] It is radiating 701[3] times the luminosity of the Sun from its photosphere at an effective temperature of 13,932 K.[3]

References
  1. 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. 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. Zorec, J.; Royer, F. (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy & Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID 55586789, A120.
  4. Molnar, Michael R. (July 1972), "The Helium-Weak Stars", Astrophysical Journal, 175: 453, Bibcode:1972ApJ...175..453M, doi:10.1086/151570.
  5. Wu, Yue; et al. (2010), "Coudé-feed stellar spectral library – atmospheric parameters", Astronomy & Astrophysics, 525: A71, arXiv:1009.1491, Bibcode:2011A&A...525A..71W, doi:10.1051/0004-6361/201015014, S2CID 53480665.
  6. Huang, W.; Gies, D. R. (August 2008), "Stellar Rotation in Field and Cluster B Stars", The Astrophysical Journal, 683 (2): 1045–1051, arXiv:0805.2133, Bibcode:2008ApJ...683.1045H, doi:10.1086/590106, S2CID 18926523.
  7. Grosbol, P. J. (June 1978), "Space velocities and ages of nearby early-type stars", Astronomy and Astrophysics, Supplemental Series, 32: 409-421, Bibcode:1978A&AS...32..409G.
  8. "HD 173936". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-02-07.
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