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- Westerlund_2 abstract "Westerlund 2 is a young massive obscured star cluster with an estimated age of about one or two million years. It contains some of the hottest, brightest, and most massive stars known. The cluster contains a dozen of O stars, of which at least three are eclipsing binaries, many pre–main sequence stars and two Wolf-Rayet Stars: the binary WR20a and the single star WR20b, all of spectral type WN6ha. They are probably not actually Wolf-Rayet stars, i.e. they are core-hydrogen-burning stars, just like the sun, but due to their large mass loss rate they appear to be Wolf Rayet stars.It was shown recently that the core of the cluster contains several examples of rare very hot stars (Rauw et al. 2007, A&A, 463, 981). Just outside the cluster a massive eclipsing binary WR20a is found at 30 arcseconds (about 1.1 pc in projection), the bright yellow spot just on the lower right side of the cluster center.As its name indicates, the Westerlund 2 cluster was discovered by Bengt Westerlund in the sixties (Westerlund 1961, PASP, 73, 51 and 1968, ApJ, 154, L67 – see http://vizier.u-strasbg.fr/cgi-bin/Dic-Simbad?Cl%20Westerlund ) but its stellar content was assessed only in later years (Moffat et al. 1991, AJ, 102, 642; Rauw et al. 2007, A&A, 463, 981). WR20a has also been known since the sixties (1966, CoBos, 35, 1) but its binarity was only discovered in 2004 by a Belgian team.".
- Westerlund_2 thumbnail Westerlund-2-Cluster-NASA.jpg?width=300.
- Westerlund_2 wikiPageExternalLink ap100626.html.
- Westerlund_2 wikiPageExternalLink 0801.0647.
- Westerlund_2 wikiPageExternalLink 0404551.
- Westerlund_2 wikiPageExternalLink 0405338.
- Westerlund_2 wikiPageExternalLink 0612622.
- Westerlund_2 wikiPageExternalLink nph-bib_query?1991AJ....102..642M&db_key=AST&nosetcookie=1.
- Westerlund_2 wikiPageExternalLink wd2_hand.html.
- Westerlund_2 wikiPageExternalLink sim-id?protocol=html&Ident=WR20a&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id.
- Westerlund_2 wikiPageExternalLink Dic-Simbad?Cl%20Westerlund.
- Westerlund_2 wikiPageExternalLink index.html.
- Westerlund_2 wikiPageID "4970436".
- Westerlund_2 wikiPageRevisionID "588217596".
- Westerlund_2 absmagV "13.5".
- Westerlund_2 age "?".
- Westerlund_2 appmagV "15".
- Westerlund_2 bV "−0.33".
- Westerlund_2 class "WN6ha + WN6ha".
- Westerlund_2 constell Carina_(constellation).
- Westerlund_2 distLy "20000".
- Westerlund_2 distPc "7900".
- Westerlund_2 epoch "J2000".
- Westerlund_2 hasPhotoCollection Westerlund_2.
- Westerlund_2 luminosity "106".
- Westerlund_2 mass "82.7".
- Westerlund_2 metal "?".
- Westerlund_2 pError "0".
- Westerlund_2 parallax "0".
- Westerlund_2 propMoDec "0".
- Westerlund_2 propMoRa "0".
- Westerlund_2 radialV "0".
- Westerlund_2 radius "19.3".
- Westerlund_2 rotation "?".
- Westerlund_2 temperature "43000".
- Westerlund_2 uB "?".
- Westerlund_2 variable "Eclipsing".
- Westerlund_2 subject Category:Carina_(constellation).
- Westerlund_2 subject Category:Objects_within_100_kly_of_Earth.
- Westerlund_2 subject Category:Open_clusters.
- Westerlund_2 subject Category:Westerlund.
- Westerlund_2 type CelestialBody.
- Westerlund_2 type Star.
- Westerlund_2 type PhysicalBody.
- Westerlund_2 comment "Westerlund 2 is a young massive obscured star cluster with an estimated age of about one or two million years. It contains some of the hottest, brightest, and most massive stars known. The cluster contains a dozen of O stars, of which at least three are eclipsing binaries, many pre–main sequence stars and two Wolf-Rayet Stars: the binary WR20a and the single star WR20b, all of spectral type WN6ha. They are probably not actually Wolf-Rayet stars, i.e.".
- Westerlund_2 label "Westerlund 2".
- Westerlund_2 label "Westerlund 2".
- Westerlund_2 label "Westerlund 2".
- Westerlund_2 label "Westerlund 2".
- Westerlund_2 label "Westerlund 2".
- Westerlund_2 label "وسترلوند 2".
- Westerlund_2 label "維斯特盧2".
- Westerlund_2 sameAs Westerlund_2.
- Westerlund_2 sameAs Westerlund_2.
- Westerlund_2 sameAs Westerlund_2.
- Westerlund_2 sameAs 웨스터룬드_2.
- Westerlund_2 sameAs Westerlund_2.
- Westerlund_2 sameAs m.0cxryg.
- Westerlund_2 sameAs Q1331013.
- Westerlund_2 sameAs Q1331013.
- Westerlund_2 wasDerivedFrom Westerlund_2?oldid=588217596.
- Westerlund_2 depiction Westerlund-2-Cluster-NASA.jpg.
- Westerlund_2 isPrimaryTopicOf Westerlund_2.
- Westerlund_2 name "WR 20a".
