Cepheus OB1

Cepheus OB1
NGC 7380 and Wizard nebula
Observation data (J2000.0 epoch)
Right ascension22h 29m 00s[1]
Declination+56° 36′ 00″[1]
Distance3,400+220
−200 pc[2]
Physical characteristics
Radius815[3]
Associations
ConstellationCepheus
See also: Open cluster, List of open clusters

Cepheus OB1 is an OB association around the cluster NGC 7380. The region is approximately 3,400 parsecs from Earth in the constellation of Cepheus, although many of its stars lie in neighboring constellations like Cassiopeia.

Cepheus OB1 contains dozens of O and B class stars, but the brightest members are cool supergiants and hypergiants such as V509 Cassiopeiae (HR 8752) and RW Cephei.[4]

Prominent stars
Star Spectral type Notes
RW Cephei K2 0-Ia Variable, one of the largest stars known
V354 Cephei M2.5 Iab / M3.5 Ib Variable, one of the largest stars known
DH Cephei O5.5 V / O6 V Binary
HR 8752 G0 Ia-0 Yellow hypergiant
W Cephei K0ep-M2ep Ia + B0/B1 Binary
U Lacertae M4epIab + B Spectroscopic binary
WR 152 WN3(h) Wolf–Rayet star

References

  1. ^ a b "Ass Cep OB 1". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2016-10-28.
  2. ^ Parker, Richard J.; Crowther, Paul A.; Rate, Gemma (2020). "Unlocking Galactic Wolf–Rayet stars with Gaia DR2 – II. Cluster and association membership". Monthly Notices of the Royal Astronomical Society. 495 (1): 1209–1226. arXiv:2005.02533. Bibcode:2020MNRAS.495.1209R. doi:10.1093/mnras/staa1290. S2CID 218516882.
  3. ^ 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.
  4. ^ Humphreys, R. M. (1978). "Studies of luminous stars in nearby galaxies. I. Supergiants and O stars in the Milky Way". The Astrophysical Journal Supplement Series. 38: 309. Bibcode:1978ApJS...38..309H. doi:10.1086/190559.