6 Lacertae is a binary star[5] system in the northern constellation of Lacerta, located around 1,900 light years from the Sun.[1] It is visible to the naked eye as a dim, blue-white hued star with a combined apparent visual magnitude of 4.52.[2] The system is moving closer to the Earth with a heliocentric radial velocity of −9 km/s,[2] and is a suspected member of the Lac OB1 association.[4]
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Lacerta |
| Right ascension | 22h 30m 29.26005s[1] |
| Declination | +43° 07′ 24.1565″[1] |
| Apparent magnitude (V) | 4.52[2] |
| Characteristics | |
| Spectral type | B2 IV[3] |
| B−V color index | −0.086±0.018[2] |
| Astrometry | |
| Radial velocity (Rv) | −8.7±0.9[2] km/s |
| Proper motion (μ) | RA: −4.800[1] mas/yr Dec.: −2.598[1] mas/yr |
| Parallax (π) | 1.7577 ± 0.2697 mas[1] |
| Distance | approx. 1,900 ly (approx. 570 pc) |
| Absolute magnitude (MV) | −2.62[4] |
| Orbit[5] | |
| Period (P) | 880 days |
| Eccentricity (e) | 0.30 |
| Periastron epoch (T) | 2,416,300 JD |
| Argument of periastron (ω) (secondary) | 190° |
| Semi-amplitude (K1) (primary) | 9 km/s |
| Details | |
| Mass | 12.5±0.6[6] M☉ |
| Radius | 6.9[7] R☉ |
| Luminosity (bolometric) | 34,590[8] L☉ |
| Surface gravity (log g) | 3.56[9] cgs |
| Temperature | 21,150[8] K |
| Metallicity [Fe/H] | −0.04[9] dex |
| Rotational velocity (v sin i) | 70[10] km/s |
| Age | 15.7±0.1[6] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
This system forms a single-lined spectroscopic binary with an orbital period of 880 days and an eccentricity of 0.3.[5] The visible component has a stellar classification of B2 IV,[3] matching a B-type subgiant star. It is about 16[6] million years old with a relatively high projected rotational velocity of 70 km/s.[10] The star has 12.5[6] times the mass of the Sun and about 7[7] times the Sun's radius. It is radiating a net 34,590[8] times the Sun's luminosity from its photosphere at an effective temperature of 21,150 K.[8]
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 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 Kaltcheva, Nadia (October 2009), "Lacerta OB1 Revisited", Publications of the Astronomical Society of the Pacific, 121 (884): 1045–1053, Bibcode:2009PASP..121.1045K, doi:10.1086/606037, S2CID 120329065.
- ^ a b c Beardsley, Wallace R. (1969), "The Radial Velocities of 129 Stars in the Years 1906 to 1917", Publications of the Allegheny Observatory of the University of Pittsburgh, 7: 91–263, Bibcode:1969PAllO...8...91B.
- ^ a b c d Tetzlaff, N.; et al. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society, 410 (1): 190–200, arXiv:1007.4883, Bibcode:2011MNRAS.410..190T, doi:10.1111/j.1365-2966.2010.17434.x, S2CID 118629873.
- ^ a b Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics, 367 (Third ed.): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
- ^ 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 Gies, Douglas R.; Lambert, David L. (March 1992), "Carbon, Nitrogen, and Oxygen Abundances in Early B-Type Stars", Astrophysical Journal, 387: 673, Bibcode:1992ApJ...387..673G, doi:10.1086/171116.
- ^ a b Strom, Stephen E.; et al. (2005), "B Star Rotational Velocities in h and χ Persei: A Probe of Initial Conditions during the Star Formation Epoch?", The Astronomical Journal, 129 (2): 809–828, arXiv:astro-ph/0410337, Bibcode:2005AJ....129..809S, doi:10.1086/426748, S2CID 15059129.
- ^ "6 Lac". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-01-28.