Variable star in the constellation Cepheus
W Cephei
Observation dataEpoch J2000 Equinox J2000
Constellation
Cepheus
Right ascension
22h 36m 27.56307s [ 2]
Declination
+58° 25′ 33.9554″[ 2]
Apparent magnitude (V)
6.83 - 9.20[ 3]
Characteristics
Evolutionary stage
Red supergiant + non-supergiant B class star
Spectral type
K0ep-M2ep Ia + B0/B1[ 3]
Variable type
SRc [ 3]
Astrometry Radial velocity (Rv )−44.64[ 4] km/s Proper motion (μ) RA: −3.176[ 2] mas /yr Dec.: −2.277[ 2] mas /yr Distance 2,427[ 5] pc Absolute magnitude (MV )−7[ 6] + −3.5[ 7]
Orbit [ 8] Period (P) 2,075 d Eccentricity (e)0.149 Inclination (i)90°
Details Radius 666.2+20.7 −11.1 [ 2] R ☉ Luminosity 292,000[ 9] L ☉ Surface gravity (log g )0.18[ 2] cgs Temperature 3,681[ 9] – 4,400[ 10] K Metallicity 0.0205[ 2]
Other designations W Cep,
BD +57°2568,
HD 214369,
HIP 111592,
GSC 03995-00937,
SAO 34614,
PPM 40864,
GC 31569,
UCAC3 297-183471,
IRAS 22345+5809,
2MASS J22362757+5825340,
AAVSO 2232+57
Database references SIMBAD data
W Cephei is a spectroscopic binary and variable star located in the constellation Cepheus . It is thought to be a member of the Cep OB1 stellar association at about 8,000 light years.[ 5] [ 11] The supergiant primary star is one of the largest known stars and as well as one of the most luminous red supergiants.
^ Cite error: The named reference Polyakova
was invoked but never defined (see the help page ).
^ a b c d e f g 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 Samus, N. N.; et al. (2017). "General Catalogue of Variable Stars". Astronomy Reports . 5.1. 61 (1): 80–88. Bibcode :2017ARep...61...80S . doi :10.1134/S1063772917010085 . S2CID 125853869 .
^ Famaey, B.; Jorissen, A.; Luri, X.; Mayor, M.; Udry, S.; Dejonghe, H.; Turon, C. (2005). "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters". Astronomy and Astrophysics . 430 (1): 165. arXiv :astro-ph/0409579 . Bibcode :2005A&A...430..165F . doi :10.1051/0004-6361:20041272 . S2CID 17804304 .
^ a b Famaey, B.; Jorissen, A.; Luri, X.; Mayor, M.; Udry, S.; Dejonghe, H.; Turon, C. (2005). "Local kinematics of K and M giants from CORAVEL/Hipparcos/Tycho-2 data. Revisiting the concept of superclusters". Astronomy and Astrophysics . 430 (1): 165. arXiv :astro-ph/0409579 . Bibcode :2005A&A...430..165F . doi :10.1051/0004-6361:20041272 . S2CID 17804304 .
^ Cite error: The named reference wallerstein
was invoked but never defined (see the help page ).
^ Stickland, David J. (1988). "IUE and stars with composite spectra". In ESA . 281 : 27. Bibcode :1988ESASP.281b..27S .
^ Petrova, A. V.; Orlov, V. V. (1999). "Apsidal Motion in Double Stars. I. Catalog" . The Astronomical Journal . 117 (1): 587. Bibcode :1999AJ....117..587P . doi :10.1086/300671 . S2CID 122386285 .
^ a b Dorn-Wallenstein, Trevor Z.; Levesque, Emily M.; Neugent, Kathryn F.; Davenport, James R. A.; Morris, Brett M.; Gootkin, Keyan (2020). "Short Term Variability of Evolved Massive Stars with TESS II: A New Class of Cool, Pulsating Supergiants" . The Astrophysical Journal . 902 (1): 24. arXiv :2008.11723 . Bibcode :2020ApJ...902...24D . doi :10.3847/1538-4357/abb318 . S2CID 221340538 .
^ Garmany, C. D.; Stencel, R. E. (1992). "Galactic OB associations in the northern Milky Way Galaxy. I - Longitudes 55 deg to 150 deg". Astronomy and Astrophysics Supplement Series . 94 : 211. Bibcode :1992A&AS...94..211G .
^ Cite error: The named reference polyakova
was invoked but never defined (see the help page ).