Berkeley 87 Explained
| Berkeley 87 |
| Class: | Open Cluster |
| Epoch: | J2000 |
| Ra: | [1] |
| Dist Ly: | ~1650 pc |
| Size V: | 8 |
| Absmag V: | 7.9 |
| Constellation: | Cygnus |
| Names: | Dolidze 7, OCl 161, C 2019+372, OCISM 34, MWSC 3325 |
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]
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☉.
Prominent stars[4] !Star name!Effective temperature!Absolute magnitude!Bolometric magnitude!Mass !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 |
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See also
Notes and References
- Berkeley 87 . 31 December 2020.
- 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. 1982PASP...94..789T. 10.1086/131065. 123595477 . free.
- 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. 1004.0462. 2010ApJ...715.1327S. 10.1088/0004-637X/715/2/1327. 119232391.
- Massey, P.. Degioia-Eastwood, K.. Kathy Eastwood. 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. astro-ph/0010654. 2001AJ....121.1050M. 10.1086/318769. 53345173.
