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Pismis 20

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Pismis 20
Observation data (J2000 epoch)
Right ascension15 15 23.0
Declination−59° 04′ 00″
Distance3,270 pc
Physical characteristics
Estimated age5×10 years
Other designationsVDBH 170, MWSC 2281, C 1511-588, OCl 932
Associations
ConstellationCircinus
See also: Open cluster, List of open clusters

Pismis 20 is a compact open cluster in Circinus. It is located at the heart of the Circinus OB1 association in the Norma arm of the Milky Way Galaxy. Pismis 20 is about 3,270 pc away and only about 5 million years old. HD 134959, a blue supergiant variable star also called CX Circinus, is the brightest star in Pismis 20.

Prominent stars
Star name MV number Effective temperature Absolute magnitude Bolometric magnitude Mass (M☉) Spectral type Ref.
WR 67 11 56000 -4.03 -8 9 WN6-w
CX Circinus (HD 134959) 1 20900 -7.9 -9.8 50 B2.5Ia
6 42600 -4.2 -8.2 34 B
2 34400 -5.4 -8.8 34 O8.5I
3 28800 -5.5 -8.4 26 B0I
7 30200 -5 -8 23 B0III
4 29500 -5 -7.9 23 B0.2III
5 30200 -4.5 -7.5 20 B0III

References

  1. ^ "Pismis 20". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 30 December 2020.
  2. Turner, David G. (1996). "PISMIS 20 - A Case Study of a Young Cluster". Astronomical Journal. 111: 828. Bibcode:1996AJ....111..828T. doi:10.1086/117829.
  3. Orsatti, A. M.; Vega, E. I.; Marraco, H. G. (2003). "Pismis 20: One or two clusters?". Astronomy and Astrophysics. 408: 135–140. Bibcode:2003A&A...408..135O. doi:10.1051/0004-6361:20030919. hdl:11336/36974 – via 2003A&A...408..135O.
  4. Sota, A.; Maíz Apellániz, J.; Morrell, N. I.; Barbá, R. H.; Walborn, N. R.; Gamen, R. C.; Arias, J. I.; Alfaro, E. J.; Oskinova, L. M. (2019). "The Galactic WN stars revisited. Impact of Gaia distances on fundamental stellar parameters". Astronomy & Astrophysics. A57: 625. arXiv:1904.04687. Bibcode:2019A&A...625A..57H. doi:10.1051/0004-6361/201834850. S2CID 104292503.
  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.


Constellation of Circinus
List of stars in Circinus
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