  | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cepheus |
| Right ascension | 22h 11m 30.57571s[1] |
| Declination | +59° 24′ 52.15″[1] |
| Apparent magnitude (V) | +5.050[2] |
| Characteristics | |
| Evolutionary stage | Blue supergiant |
| Spectral type | O6.5If(n)p[3] |
| U−B color index | −0.622[2] |
| B−V color index | +0.237[2] |
| Astrometry | |
| Radial velocity (Rv) | -75.10[4] km/s |
| Proper motion (μ) | RA: -7.46[1] mas/yr Dec.: -11.09[1] mas/yr |
| Parallax (π) | 1.65 ± 0.22 mas[1] |
| Distance | 950[2] pc |
| Absolute magnitude (MV) | -6.43[2] |
| Details[2] | |
| Mass | 51.4 M☉ |
| Radius | 18[5] - 21[6] R☉ |
| Luminosity | 630,000 L☉ |
| Surface gravity (log g) | 3.54 cgs |
| Temperature | 36,000 K |
| Rotation | 210 |
| Age | 4.0 Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Lambda Cephei (λ Cephei) is a fifth magnitude blue supergiant star in the constellation Cepheus, one of the hottest and most luminous visible to the naked eye.
- ^ 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 d e f Bouret, J.-C.; Hillier, D. J.; Lanz, T.; Fullerton, A. W. (2012). "Properties of Galactic early-type O-supergiants. A combined FUV-UV and optical analysis". Astronomy & Astrophysics. 544: A67. arXiv:1205.3075. Bibcode:2012A&A...544A..67B. doi:10.1051/0004-6361/201118594. S2CID 119280104.
- ^ 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 Series. 193 (2): 24. arXiv:1101.4002. Bibcode:2011ApJS..193...24S. doi:10.1088/0067-0049/193/2/24. ISSN 0067-0049. S2CID 119248206.
- ^ 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. ISSN 1063-7737. S2CID 119231169.
- ^ Bianchi, L.; Garcia, M. (2002). "The Effective Temperatures of Mid-O Stars". The Astrophysical Journal. 581 (1): 610–625. Bibcode:2002ApJ...581..610B. doi:10.1086/343042.
- ^ Repolust, T.; Puls, J.; Herrero, A. (2004). "Stellar and wind parameters of Galactic O-stars. The influence of line-blocking/blanketing". Astronomy and Astrophysics. 415 (1): 349–376. Bibcode:2004A&A...415..349R. doi:10.1051/0004-6361:20034594.