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) | |
| Constellation | Cepheus |
| Right ascension | 22h 29m 00s[1] |
| Declination | +56° 36′ 00″[1] |
| Distance | 3,400+220 −200 pc[2] |
| Physical characteristics | |
| Radius | 815[3] |
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]
| 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 |
| HR 8752 | G0 Ia-0 | Yellow hypergiant |
| W Cephei | K0ep-M2ep Ia + B0/B1 | Binary, one of the largest stars known |
| U Lacertae | M4epIab + B | Spectroscopic binary |
References
- "Ass Cep OB 1". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2016-10-28.
- 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.
- 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.
- 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.
External links
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