10 Lacertae (10 Lac) is a star in the constellation Lacerta. With an apparent magnitude of 4.9, it is located around 550 parsecs (1,800 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 15.67804s[1] |
| Declination | +39° 03′ 00.9724″[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: −1.274 mas/yr[1] Dec.: −5.605 mas/yr[1] |
| Parallax (π) | 2.192 ± 0.131 mas[1] |
| Distance | 1,800±103 ly (552±32 pc)[6] |
| Absolute magnitude (MV) | −4.17±0.12[6] |
| Details[6] | |
| Mass | 21.6±0.5 M☉ |
| Radius | 7.4±0.5 R☉ |
| Luminosity | 69,200+8,440 −7,520 L☉ |
| Surface gravity (log g) | 4.04±0.05 cgs |
| Temperature | 34,550±300 K |
| Rotational velocity (v sin i) | 14±1 km/s |
| Age | 3.55+0.72 −0.60[6] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
It 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.[7]
It is the star with the smallest angular diameter measured by the CHARA array, at 0.11±0.02 milliarcseconds. A study by Kathryn D. Gordon and other five astronomers used this angular diameter to find the physical size of 10 Lacertae. Using a distance of 566±59 parsecs, an average of earlier distances, they calculated a physical size 6.7±1.4 that of the Sun, or 9.3±1.9 million km.[8]
10 Lacertae has an 8th magnitude companion about one arc-minute away.[9]
References
edit- ^ a b c d Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ 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.
- ^ a b c d Aschenbrenner, P.; Przybilla, N.; Butler, K. (2023-03-01). "Quantitative spectroscopy of late O-type main-sequence stars with a hybrid non-LTE method". Astronomy and Astrophysics. 671: A36. arXiv:2301.09462. Bibcode:2023A&A...671A..36A. doi:10.1051/0004-6361/202244906. ISSN 0004-6361.
- ^ Garrison, R. F. (1994). "A Hierarchy of Standards for the MK Process". Astronomical Society of the Pacific. 60: 3. Bibcode:1994ASPC...60....3G.
- ^ Gordon, Kathryn D.; Gies, Douglas R.; Schaefer, Gail H.; Huber, Daniel; Ireland, Michael; Hillier, D. John (December 2018). "Angular Sizes and Effective Temperatures of O-type Stars from Optical Interferometry with the CHARA Array". The Astrophysical Journal. 869 (1): 37. arXiv:1812.05511. Bibcode:2018ApJ...869...37G. doi:10.3847/1538-4357/aaec04. ISSN 0004-637X.
- ^ 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.