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]
| 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] |
| Distance | 900 ± 20 ly (276 ± 5 pc) |
| Absolute magnitude (MV) | −1.14[2] |
| Details | |
| Mass | 4.59±0.23[3] M☉ |
| Luminosity | 701+194 −151[3] L☉ |
| Surface gravity (log g) | 3.81±0.08[5] cgs |
| Temperature | 13,932±96[3] K |
| Metallicity [Fe/H] | −0.04±0.08[5] dex |
| Rotational velocity (v sin i) | 116±8[6] km/s |
| Age | 22.4[7] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
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
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 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 c d e f g 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.
- ^ a b Molnar, Michael R. (July 1972), "The Helium-Weak Stars", Astrophysical Journal, 175: 453, Bibcode:1972ApJ...175..453M, doi:10.1086/151570.
- ^ a b 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.
- ^ a b 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.
- ^ a b 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.
- ^ "HD 173936". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-02-07.