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10 Lacertae 
Summary
10 Lacertae (10 Lac) is a star in the constellation Lacerta. With an apparent magnitude of 4.9, it is located around 700 parsecs (2,300 ly) distant in the small Lacerta OB1 association. It is a hot blue main-sequence star of spectral type O9V, a massive star that is currently fusing its core hydrogen. It is a suspected Beta Cephei variable star.
  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Lacerta |
| Right ascension | 22h 39m 15.67864s[1] |
| Declination | +39° 03′ 00.9712″[1] |
| Apparent magnitude (V) | 4.880[2] |
| Characteristics | |
| Spectral type | O9V[3] |
| U−B color index | −1.010[2] |
| B−V color index | −0.210[2] |
| Variable type | β Cep?[4] |
| Astrometry | |
| Radial velocity (Rv) | −10.10[5] km/s |
| Proper motion (μ) | RA: −0.32[1] mas/yr Dec.: −5.46[1] mas/yr |
| Parallax (π) | 1.89 ± 0.22 mas[1] |
| Distance | 715[6] pc |
| Absolute magnitude (MV) | −4.40[7] |
| Details[7] | |
| Mass | 26.9 M☉ |
| Radius | 8.27 R☉ |
| Luminosity | 102,000 L☉ |
| Surface gravity (log g) | 4.03 cgs |
| Temperature | 36,000 K |
| Rotational velocity (v sin i) | 35 km/s |
| Other designations | |
| Database references | |
| SIMBAD | data |
10 Lacertae was one of the first O-type stars (along with S Monocerotis) to be defined as an anchor point for the MKK spectral classification; since the early twentieth century it has served as such a point. Specifically, the star is representative of O9V stars, meaning relatively cool O-type stars on the main-sequence.[8]
10 Lacertae has an 8th magnitude companion about one arc-minute away.[9]
References edit
- ^ a b c d e van Leeuwen, F. (November 2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.
- ^ a b c Oja, T. (September 1993). "UBV photometry of stars whose positions are accurately known. VII". Astronomy and Astrophysics Supplement Series. 100 (3): 591–592. Bibcode:1993A&AS..100..591O. ISSN 0365-0138.
- ^ Sota, A.; Maíz Apellániz, J.; Walborn, N. R.; Alfaro, E. J.; Barbá, R. H.; Morrell, N. I.; Gamen, R. C.; Arias, J. I. (2011). "The Galactic O-Star Spectroscopic Survey. I. Classification System and Bright Northern Stars in the Blue-violet at R ~ 2500". The Astrophysical Journal Supplement. 193 (3): 24. arXiv:1101.4002. Bibcode:2011ApJS..193...24S. doi:10.1088/0067-0049/193/2/24. S2CID 119248206.
- ^ Samus, N. N.; Durlevich, O. V. (January 2009). "VizieR On-line Data Catalog: General Catalogue of Variable Stars". VizieR On-line Data Catalog. Bibcode:2009yCat....102025S.
- ^ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. S2CID 119231169.
- ^ Kaltcheva, N.; Golev, V. (2011). "Improved Distances to Several Galactic OB Associations". Stellar Clusters & Associations: A RIA Workshop on Gaia.: 299–303. arXiv:1107.3758. Bibcode:2011sca..conf..299K.
- ^ a b Mokiem, M. R.; de Koter, A.; Puls, J.; Herrero, A.; Najarro, F.; Villamariz, M. R. (October 2005). "Spectral analysis of early-type stars using a genetic algorithm based fitting method". Astronomy and Astrophysics. 441 (2): 711–733. arXiv:astro-ph/0506751. Bibcode:2005A&A...441..711M. doi:10.1051/0004-6361:20053522. S2CID 9965794.
- ^ Garrison, R. F. (1994). "A Hierarchy of Standards for the MK Process". Astronomical Society of the Pacific. 60: 3. Bibcode:1994ASPC...60....3G.
- ^ Dommanget, J.; Nys, O. (1994). "Catalogue of the Components of Double and Multiple stars (CCDM). First edition". Communications de l'Observatoire Royal de Belgique. 115. Bibcode:1994CoORB.115.....D.