Zeta Cephei
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Cepheus |
Right ascension | 22h 10m 51.277s[1] |
Declination | +58° 12′ 04.543″[1] |
Apparent magnitude (V) | 3.35[2] |
Characteristics | |
Evolutionary stage | Red supergiant |
Spectral type | K1.5 Ib[3] |
B−V color index | +1.55[2] |
Variable type | Eclipsing binary?[4] |
Astrometry | |
Proper motion ( | RA: 13.359±0.148 mas/yr[1] Dec.: 5.275±0.183 mas/yr[1] |
Parallax ( | 3.2972 ± 0.1456 mas[1] |
Distance | 992.7+51.2 −46 ly (304.5+15.7 −14.1 pc)[5] |
Absolute magnitude (MV) | −4.7[6] |
Details | |
Mass | 10.1±0.1[7] M☉ |
Radius | 172.7+7.5 −8.3[8] R☉ |
Luminosity | 10,024±1,052[8] L☉ |
Surface gravity (log g) | 0.75[9] cgs |
Temperature | 4,393±58[8] K |
Metallicity [Fe/H] | +0.04[8] dex |
Rotational velocity (v sin i) | 10.64[10] km/s |
Other designations | |
Database references | |
SIMBAD | data |
Zeta Cephei (
Characteristics[edit]
Zeta Cephei has a spectral classification of K1.5Ib,[3] indicating that it is a lower luminosity red supergiant star. It is about 173 times larger than the Sun and has a surface temperature of 4,393 K.[8] The luminosity of Zeta Cephei is approximately 10,000 times that of the Sun.[8] At a distance of about 840 light-years,[11] Zeta Cephei has an apparent magnitude (m) of 3.4 and an absolute magnitude (M) of -4.7. The star has a metallicity approximately 1.6 times that of the Sun; i.e., it contains 1.6 times as much heavy-element material as the Sun.
At a mass of 10.1 M☉, Zeta Cephei might end its life in a core-collapse supernova, and has been listed as a likely pre-supernova candidate by a 2022 study. It could also provide observable pre-supernova neutrino signals, just hours before the core collapses.[7]
Possible companion star[edit]
Hekker et al. (2008) have detected a periodicity of 533 days, hinting at the possible presence of an as yet unseen companion.[12] It is listed as a possible eclipsing binary with a very small amplitude.[4]
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 Ducati, J. R. (2002-01-01). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". VizieR Online Data Catalog. 2237. Bibcode:2002yCat.2237....0D. Zeta Cephei's database entry at VizieR.
- ^ a b Morgan, W. W.; Keenan, P. C. (1973). "Spectral Classification". Annual Review of Astronomy and Astrophysics. 11: 29–50. Bibcode:1973ARA&A..11...29M. doi:10.1146/annurev.aa.11.090173.000333.
- ^ 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: 02025. Bibcode:2009yCat....102025S.
- ^ Bailer-Jones, C. A. L.; Rybizki, J.; Fouesneau, M.; Demleitner, M.; Andrae, R. (2021-03-01). "Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3". The Astronomical Journal. 161 (3): 147. arXiv:2012.05220. Bibcode:2021AJ....161..147B. doi:10.3847/1538-3881/abd806. ISSN 0004-6256. Data about this star can be seen here.
- ^ Luck, R. E. (1982). "The chemical composition of late-type supergiants. IV - Homogeneous abundances and galactic metallicity trends". Astrophysical Journal. 256: 177. Bibcode:1982ApJ...256..177L. doi:10.1086/159895.
- ^ a b Machado, L. N.; Abe, K.; Hayato, Y.; Hiraide, K.; Ieki, K.; Ikeda, M.; Kameda, J.; Kanemura, Y.; Kaneshima, R.; Kashiwagi, Y.; Kataoka, Y.; Miki, S.; Mine, S.; Miura, M.; Moriyama, S. (2022-08-12). "Pre-supernova Alert System for Super-Kamiokande". The Astrophysical Journal. 935 (1): 40. arXiv:2205.09881. Bibcode:2022ApJ...935...40M. doi:10.3847/1538-4357/ac7f9c. ISSN 0004-637X.
- ^ a b c d e f Baines, Ellyn K.; Armstrong, J. Thomas; Clark III, James H.; Gorney, Jim; Hutter, Donald J.; Jorgensen, Anders M.; Kyte, Casey; Mozurkewich, David; Nisley, Ishara; Sanborn, Jason; Schmitt, Henrique R.; van Belle, Gerard T. (2021-11-01). "Angular Diameters and Fundamental Parameters of Forty-Four Stars from the Navy Precision Optical Interferometer". The Astronomical Journal. 162 (5): 198. arXiv:2211.09030. Bibcode:2021AJ....162..198B. doi:10.3847/1538-3881/ac2431. ISSN 0004-6256.
- ^ Mallik, Sushma V. (December 1999), "Lithium abundance and mass", Astronomy and Astrophysics, 352: 495–507, Bibcode:1999A&A...352..495M
- ^ Hekker, S.; Meléndez, J. (2007). "Precise radial velocities of giant stars. III. Spectroscopic stellar parameters". Astronomy and Astrophysics. 475 (3): 1003. arXiv:0709.1145. Bibcode:2007A&A...475.1003H. doi:10.1051/0004-6361:20078233. S2CID 10436552.
- ^ 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. S2CID 18759600.Vizier catalog entry
- ^ Hekker; et al. (2008). "Precise radial velocities of giant stars. IV. A correlation between surface gravity and radial velocity variation and a statistical investigation of companion properties". Astronomy and Astrophysics. 480 (1): 215–222. arXiv:0801.0741. Bibcode:2008A&A...480..215H. doi:10.1051/0004-6361:20078321. S2CID 33442610.