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Berkeley 87 is an open cluster in a heavily obscured region of the Milky Way in Cygnus.[2] The rare WO type Wolf–Rayet star WR 142 is a member of Berkeley 87.[3]

Berkeley 87
Observation data (J2000 epoch)
ConstellationCygnus
Right ascension20h 21m 43.01s[1]
Declination+37° 22′ 13.8″[1]
Distance~1650 pc
Apparent dimensions (V)8
Physical characteristics
Other designationsDolidze 7, OCl 161, C 2019+372, OCISM 34, MWSC 3325
See also: Open cluster, List of open clusters

This cluster contains HD 229059 which, as of August 2021, is the nearest known star to Earth with a Bolometric Luminosity greater than 1 million L☉.[4]

Prominent stars[5]
Star name Effective temperature Absolute magnitude Bolometric magnitude Mass (M☉) Spectral type
WR 142 (Berkeley 87–29) 200000 K -3.13 -10.1 28.6 WO2
HD 229059 (Berkeley 87–3) 26300 K -7.7 -10.3 69 B1Ia
Berkeley 87-25 35700 K -5.6 -9.1 39 O8.5III
Berkeley 87-15 37800 K -5 -8.6 34 B[e]
Berkeley 87-4 29500 K -5 -7.9 23 B0.2III

References


  1. "Berkeley 87". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 31 December 2020.
  2. Turner, D. G.; Forbes, D. (1982). "Berkeley 87, a heavily-obscured young cluster associated with the ON2star-formation complex and containing the WO star Stephenson 3". Publications of the Astronomical Society of the Pacific. 94: 789–801. Bibcode:1982PASP...94..789T. doi:10.1086/131065.
  3. Sokal, Kimberly R.; Skinner, Stephen L.; Zhekov, Svetozar A.; Güdel, Manuel; Schmutz, Werner (2010). "Chandra Detects the Rare Oxygen-type Wolf-Rayet Star WR 142 and OB Stars in Berkeley 87". The Astrophysical Journal. 715 (2): 1327–1337. arXiv:1004.0462. Bibcode:2010ApJ...715.1327S. doi:10.1088/0004-637X/715/2/1327. S2CID 119232391.
  4. "List of most luminous stars".
  5. Massey, P.; Degioia-Eastwood, K.; Waterhouse, E. (2001). "The Progenitor Masses of Wolf-Rayet Stars and Luminous Blue Variables Determined from Cluster Turnoffs. II. Results from 12 Galactic Clusters and OB Associations". The Astronomical Journal. 121 (2): 1050–1070. arXiv:astro-ph/0010654. Bibcode:2001AJ....121.1050M. doi:10.1086/318769. S2CID 53345173.


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