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Markarian 50 
Summary
Markarian 50 is an open cluster in the Milky Way galaxy. It is about 3,460 pc away in the constellation Cassiopeia.[2] Markarian 50 is a very young open cluster, only about 7.5 million years old. Markarian 50 may be a member of the OB association Cassiopeia OB2.[2] The Wolf-Rayet star WR 157 is a member of Markarian 50.[3]
| Markarian 50 | |
|---|---|
 | |
| Observation data (J2000 epoch) | |
| Right ascension | 23h 15m 15.1s[1] |
| Declination | +60° 26′ 02″[1] |
| Distance | 3,460 pc |
| Physical characteristics | |
| Estimated age | 7.5 million years |
| Other designations | Cl Basel 3, Cl Mrk 50, OCISM 56, MWSC 3712, C 2313+602, Cl Biurakan 3, OCl 257 |
| Associations | |
| Constellation | Cassiopeia |
| Star name | Effective temperature | Absolute magnitude | Bolometric magnitude | Mass (M☉) | Spectral type |
|---|---|---|---|---|---|
| HD 219460 A | 30200 | -4.7 | -7.7 | 21 | B0III |
| WR 157 (Companion to HD 219460 A) | 65000 | 20 | WN4.5 | ||
| Mrk50-31 | 28200 | -4.6 | -7.4 | 19 | B0.5I |
| Mrk50-23 | 23600 | -4.5 | -6.7 | 14 | B1III |
| Mrk50-30A | 22400 | -3.6 | -5.7 | 11 | B1.5V |
| Mrk50-1 | 22400 | -2.8 | -4.8 | 9 | B1.5V |
References edit
- ^ a b "Cl Mrk 50". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 29 December 2020.
- ^ a b Baume, Gustavo; Vázquez, Rubén A.; Carraro, Giovanni (December 2004). "The young open cluster Markarian 50". Monthly Notices of the Royal Astronomical Society. 355 (2): 475–484. Bibcode:2004MNRAS.355..475B. doi:10.1111/j.1365-2966.2004.08337.x. hdl:11336/38930. ISSN 0035-8711. S2CID 122774454.
- ^ Turner, D. G.; Moffat, A. F. J.; Lamontagne, R.; Maitzen, H. M. (August 1983). "The WN4.5 component of HD 219460 in the open cluster Markarian 50". The Astronomical Journal. 88: 1199–1209. Bibcode:1983AJ.....88.1199T. doi:10.1086/113410. ISSN 0004-6256. S2CID 120580751.
- ^ 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.