HD 167965 is a single[4][7] star in the northern constellation of Lyra. It is dimly visible to the naked eye on a sufficiently dark night, having an apparent visual magnitude of 5.56.[2] The star is located at a distance of approximately 590 light years from the Sun based on parallax. It is drifting closer with a radial velocity of −20.5 km/s and is predicted to come as near as 72.7 light-years in around 8.5 million years.[2]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Lyra |
| Right ascension | 18h 15m 38.77722s[1] |
| Declination | +42° 09′ 33.6439″[1] |
| Apparent magnitude (V) | 5.56[2] |
| Characteristics | |
| Spectral type | B7IV[3][2][4] or B8V[5] |
| U−B color index | –0.469[2] |
| B−V color index | −0.111±0.001[2] |
| Astrometry | |
| Radial velocity (Rv) | −20.5±0.9[2] km/s |
| Proper motion (μ) | RA: –2.618[1] mas/yr Dec.: 0.815[1] mas/yr |
| Parallax (π) | 5.5547 ± 0.1389 mas[1] |
| Distance | 590 ± 10 ly (180 ± 5 pc) |
| Absolute bolometric magnitude (Mbol) | −0.73[2] |
| Details | |
| Mass | 4.00±0.01 M☉[6] 4.498±0.225[7] M☉ |
| Radius | 3.2 R☉[8] 4.006±0.200[7] R☉ |
| Luminosity | 337.52[2] L☉ |
| Luminosity (bolometric) | 381[6] L☉ |
| Temperature | 13,100[6] K |
| Rotational velocity (v sin i) | 187±14 km/s[9] 201[10] km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
The stellar classification of HD 167965 is B7IV,[3] matching a late B-type star that may have left the main sequence. It is spinning rapidly with a projected rotational velocity of 187 km/s.[9] The star has four times the mass and radius of the Sun, and is radiating 381 times the luminosity of the Sun from its photosphere at an effective temperature of 13,100 K.[6]
In 1925, Otto Struve included this star in a list of newly discovered spectroscopic binaries,[12] although that is no longer held to be the case.[4][7]
References
edit- ^ a b c d e 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 i 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 Lesh, Janet Rountree (December 1968). "The Kinematics of the Gould Belt: an Expanding Group?". Astrophysical Journal Supplement. 17: 371. Bibcode:1968ApJS...17..371L. doi:10.1086/190179.
- ^ a b c 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.
- ^ Palmer, D. R.; et al. (1968). "The radial velocities spectral types and projected rotational velocities of 633 bright northern A stars". Royal Observatory Bulletin. 135: 385. Bibcode:1968RGOB..135..385P.
- ^ a b c d Hohle, M. M.; et al. (April 2010). "Masses and luminosities of O- and B-type stars and red supergiants". Astronomische Nachrichten. 331 (4): 349. arXiv:1003.2335. Bibcode:2010AN....331..349H. doi:10.1002/asna.200911355. S2CID 111387483.
- ^ a b c d Kervella, Pierre; et al. (March 2019). "Stellar and substellar companions of nearby stars from Gaia DR2. Binarity from proper motion anomaly". Astronomy & Astrophysics. 623: 23. arXiv:1811.08902. Bibcode:2019A&A...623A..72K. doi:10.1051/0004-6361/201834371. S2CID 119491061. A72.
- ^ Pasinetti Fracassini, L. E.; et al. (2001). "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)". Astronomy & Astrophysics. 367 (2) (Third ed.): 521–24. arXiv:astro-ph/0012289. Bibcode:2001A&A...367..521P. doi:10.1051/0004-6361:20000451. S2CID 425754.
- ^ a b Stoeckley, T. R.; et al. (May 1984). "Absorption line profiles for 39 rapidly rotating stars". Monthly Notices of the Royal Astronomical Society. 208: 459. Bibcode:1984MNRAS.208..459S. doi:10.1093/mnras/208.3.459.
- ^ Uesugi, Akira; Fukuda, Ichiro (1970), "Catalogue of rotational velocities of the stars", Contributions from the Institute of Astrophysics and Kwasan Observatory, University of Kyoto, Bibcode:1970crvs.book.....U
- ^ "HD 167965". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2021-01-23.
- ^ Struve, O. (December 1925). "Twelve new spectroscopic binaries". Astrophysical Journal. 62: 434. Bibcode:1925ApJ....62..434S. doi:10.1086/142944.