A search for OB associations near Southern long-period Cepheids. IV. XY Carinae, GT Carinae, WZ Sagittarii, and SW Velorum

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dc.creator Turner, David Gerald, 1945-
dc.creator Danks, T. A.
dc.creator Forbes, Douglas
dc.date.accessioned 2016-11-24T16:22:48Z
dc.date.available 2016-11-24T16:22:48Z
dc.date.issued 1993-03
dc.identifier.issn 0067-0049
dc.identifier.uri http://library2.smu.ca/handle/01/26692
dc.description Publisher's version/PDF en_CA
dc.description.abstract We report UBV photometry for fields surrounding four long-period Cepheids in the Southern Milky Way. No potential early-type companions are detected around XY Car, which appears to be relatively isolated. However, an anonymous group of nine B-type and two possible FG supergiant stars are detected as possible companions to GT Car, despite its location at a seemingly improbably large distance of 10 kpc. WZ Sgr is found to lie in a sparse, previously undetected cluster, 1.8 kpc distant, containing upward of 76 potential early-type member stars. Preliminary spectroscopic observations strengthen the case for cluster membership in this instance. SW Vel appears to belong to an older subgroup of the 2.5 kpc distant Vel OB5 association described by Turner (1979), with 28 B star candidates in its immediate vicinity. Derived space reddenings and luminosities for WZ Sgr and SW Vel are consistent with their group membership, and the parameters of their associated stars, as well as those for the potential companions of GT Car, indicate that they are of comparable age to their associated Cepheid. Information is provided for follow-up studies of these stellar groups. en_CA
dc.language.iso en en_CA
dc.publisher American Astronomical Society en_CA
dc.relation.uri http://dx.doi.org/10.1086/191756
dc.rights Article is made available in accordance with the publisher’s policy and is subject to copyright law. Please refer to the publisher’s site. Any re-use of this article is to be in accordance with the publisher’s copyright policy. This posting is in no way granting any permission for re-use to the reader/user.
dc.subject.lcsh Cepheids
dc.subject.lcsh Astronomical photometry
dc.subject.lcsh UBV system (Astronomy)
dc.title A search for OB associations near Southern long-period Cepheids. IV. XY Carinae, GT Carinae, WZ Sagittarii, and SW Velorum en_CA
dc.type Text en_CA
dcterms.bibliographicCitation Astrophysical Journal. Supplement Series 85(1), 119-136. (1993) en_CA


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Article is made available in accordance with the publisher’s policy and is subject to copyright law. Please refer to the publisher’s site. Any re-use of this article is to be in accordance with the publisher’s copyright policy. This posting is in no way granting any permission for re-use to the reader/user.
 
Published Version: http://dx.doi.org/10.1086/191756
 
 

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