Galactic clusters with associated Cepheid variables. I. NGC 6087 AND S Normae

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dc.creator Turner, David Gerald, 1945-
dc.date.accessioned 2016-11-14T13:45:01Z
dc.date.available 2016-11-14T13:45:01Z
dc.date.issued 1986-07
dc.identifier.issn 0004-6256
dc.identifier.uri http://library2.smu.ca/handle/01/26640
dc.description Publisher's version/PDF en_CA
dc.description.abstract New photoelectric UBVphotometry is presented for stars in NGC 6087, the cluster containing the 9[d over dot]75 Cepheid S Normae. The data are used with published photoelectric observations for cluster stars to redetermine the cluster reddening and distance by means of a careful application of the ZAMS fitting technique. The derived distance modulus, V[subscript 0] — M[subscript V] = 9.78 [plus or minus] 0.03 (internal error), [plus or minus] 0.13 (total estimated uncertainty), is shown to be in very good agreement with the cluster distance modulus obtained from Walraven photometry and from the analysis of Strömgren and H[Beta] photometry for cluster stars. However, the hydrogen-line data are found to produce more accurate and precise results if evolutionary corrections are ignored and replaced by due consideration of the cosmic scatter in H[Beta] distance moduli introduced by the effects of stellar rotation. The excellent agreement of the various distance estimates for NGC 6087 presented in this study results from the demonstrably identical zero points shared by the various luminosity calibrations used in the analysis. Internal consistency of this type has tended to be disregarded in some recent analyses of the Cepheid calibration clusters. en_CA
dc.language.iso en en_CA
dc.publisher American Astronomical Society en_CA
dc.relation.uri http://dx.doi.org/10.1086/114141
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 Stars -- Open clusters
dc.subject.lcsh Astronomical photometry
dc.subject.lcsh UBV system (Astronomy)
dc.title Galactic clusters with associated Cepheid variables. I. NGC 6087 AND S Normae en_CA
dc.type Text en_CA
dcterms.bibliographicCitation Astronomical Journal 92(1), 111-118. (1986) 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/10.1086/114141
 
 

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