Astronomy:6 Lacertae
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| 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[1] mas |
| 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 |
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]
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
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G. Gaia DR2 record for this source at VizieR.
- ↑ 2.0 2.1 2.2 2.3 2.4 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 Lesh, Janet Rountree (December 1968), "The Kinematics of the Gould Belt: an Expanding Group?", Astrophysical Journal Supplement 17: 371, doi:10.1086/190179, Bibcode: 1968ApJS...17..371L
- ↑ 4.0 4.1 Kaltcheva, Nadia (October 2009), "Lacerta OB1 Revisited", Publications of the Astronomical Society of the Pacific 121 (884): 1045–1053, doi:10.1086/606037, Bibcode: 2009PASP..121.1045K.
- ↑ 5.0 5.1 5.2 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.
- ↑ 6.0 6.1 6.2 6.3 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, doi:10.1111/j.1365-2966.2010.17434.x, Bibcode: 2011MNRAS.410..190T.
- ↑ 7.0 7.1 Pasinetti Fracassini, L. E. et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics 367: 521–524, doi:10.1051/0004-6361:20000451, Bibcode: 2001A&A...367..521P.
- ↑ 8.0 8.1 8.2 8.3 Hohle, M. M. et al. (April 2010), "Masses and luminosities of O- and B-type stars and red supergiants", Astronomische Nachrichten 331 (4): 349, doi:10.1002/asna.200911355, Bibcode: 2010AN....331..349H.
- ↑ 9.0 9.1 Gies, Douglas R.; Lambert, David L. (March 1992), "Carbon, Nitrogen, and Oxygen Abundances in Early B-Type Stars", Astrophysical Journal 387: 673, doi:10.1086/171116, Bibcode: 1992ApJ...387..673G.
- ↑ 10.0 10.1 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, doi:10.1086/426748, Bibcode: 2005AJ....129..809S.
- ↑ "6 Lac". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=6+Lac.
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