Nu Cephei
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Cepheus |
| Right ascension | 21h 45m 26.925s[1] |
| Declination | +61° 07′ 14.90″[1] |
| Apparent magnitude (V) | 4.289[2] (4.25 - 4.35[3]) |
| Characteristics | |
| Spectral type | A2Iab[2] |
| Apparent magnitude (U) | 4.94[4] |
| Apparent magnitude (B) | 4.81[4] |
| Apparent magnitude (J) | 3.14[4] |
| Apparent magnitude (K) | 2.85[4] |
| U−B color index | +0.119[2] |
| B−V color index | +0.518[2] |
| Variable type | Alpha Cygni[3] |
| Astrometry | |
| Radial velocity (Rv) | −25.90[5] km/s |
| Proper motion (μ) | RA: −3.74 ± 0.13[1] mas/yr Dec.: −2.10 ± 0.12[1] mas/yr |
| Parallax (π) | 0.48 ± 0.14 mas[1] |
| Distance | approx. 7,000 ly (approx. 2,100 pc) |
| Absolute magnitude (MV) | −6.82[6] |
| Details | |
| Mass | 14.7[6] M☉ |
| Radius | 92[6] R☉ |
| Luminosity | 55,000[6] L☉ |
| Surface gravity (log g) | 1.35[2] cgs |
| Temperature | 8,800[2] K |
| Rotational velocity (v sin i) | 15[2] km/s |
| Age | 8[7] Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Nu Cephei is a Class A2, fourth-magnitude star in the constellation Cepheus. Nu Cephei is a white pulsating variable star and multiple star system, located about 7000 light-years from Earth. It is some 25 times as massive as the Sun. Only around 5 to 6 million years old, it has exhausted its core hydrogen fuel and swollen into a white supergiant.[8] Hohle and colleagues, using the parallax, extinction and analysis of spectrum, came up with a mass 23.64 ± 5.57 times that and luminosity 254,181 times that of the Sun.[9]
References
- ^ a b c d e van Leeuwen, F. (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.Vizier catalog entry
- ^ a b c d e f g Firnstein, M.; Przybilla, N. (2012). "Quantitative spectroscopy of Galactic BA-type supergiants. I. Atmospheric parameters". Astronomy & Astrophysics. 543: A80. arXiv:1207.0308. Bibcode:2012A&A...543A..80F. doi:10.1051/0004-6361/201219034.
- ^ a b Samus, N. N.; Durlevich, O. V.; et al. (2009). "VizieR Online Data Catalog: General Catalogue of Variable Stars (Samus+ 2007-2013)". VizieR On-line Data Catalog: B/gcvs. Originally published in: 2009yCat....102025S. 1. Bibcode:2009yCat....102025S.
- ^ a b c d Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues. 2237. Bibcode:2002yCat.2237....0D.
- ^ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065.
- ^ a b c d Verdugo, E.; Talavera, A.; Gómez De Castro, A. I. (1999). "Understanding A-type supergiants. II. Atmospheric parameters and rotational velocities of Galactic A-type supergiants". Astronomy and Astrophysics. 346: 819. Bibcode:1999A&A...346..819V.
- ^ Yüce, Kutluay (2005). "Spectral Analysis of 4 Lacertae and ν Cephei". Baltic Astronomy. 14: 51. Bibcode:2005BaltA..14...51Y.
- ^ Tetzlaff, N.; Neuhäuser, R.; Hohle, M. M. (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.
{{citation}}: CS1 maint: unflagged free DOI (link) - ^ Hohle, M. M.; Neuhäuser, R.; Schutz, B. F. (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
External links
 | This supergiant-related article is a stub. You can help Wikipedia by expanding it. |