Cepheus OB1

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.

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

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

Prominent stars
Star Spectral type Notes
RW CepheiK2 0-IaVariable, one of the largest stars known
V354 CepheiM2.5 Iab / M3.5 IbVariable, one of the largest stars known
HR 8752G0 Ia-0Yellow hypergiant
W CepheiK0ep-M2ep Ia + B0/B1Binary, one of the largest stars known
U LacertaeM4epIab + BSpectroscopic binary
WR 152 WN3(h) Wolf–Rayet star

References

  1. "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.
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