A photometric investigation of cluster membership for the Cepheid BB Sagittarii

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dc.creator Turner, David Gerald, 1945-
dc.creator Pedreros, Mario
dc.date.accessioned 2016-11-14T16:19:18Z
dc.date.available 2016-11-14T16:19:18Z
dc.date.issued 1985-07
dc.identifier.issn 0004-6256
dc.identifier.uri http://library2.smu.ca/handle/01/26642
dc.description Publisher's version/PDF en_CA
dc.description.abstract Photoelectric photometry (UBV and some VRI) is presented for the close pair of open clusters Cr 394 and NGC 6716 and for the 6[d over dot]64 classical Cepheid BB Sgr. Based upon the photometric data and star counts, the following parameters are derived for these clusters: Cr 394, [angled bracket]E[subscript B - V][angled bracket]= 0.25 [plus or minus] 0.01, V[subscript 0] — M[subscript V] = 9.04 [plus or minus] 0.08, d = 643 [plus or minus] 25 pc, age [similar or equal to]6 x 10[superscript 7] yr, nuclear radius r[subscript n] = 9 arcmin, tidal radius R[subscript c] = 27 arcmin (5 pc); NGC 6716, [angled bracket]E[subscript B - V][angled bracket] = 0.11 [plus or minus] 0.01, V[subscript 0 ] - M[subscript V] = 9.07 [plus or minus] 0.17, d = 650 [plus or minus] 52 pc, age[similar or equal to]6 x 10[superscript 7] yr, r[subscript n] = 7 arcmin. The spatial location and inferred age for BB Sgr are consistent with coronal membership in Cr 394, whose center is located only 19.6 arcmin (3.6 pc) from the Cepheid. Its intrinsic luminosity and mean light color index as a cluster member are [angled bracket]M[subscript V][angled bracket] = — 3.08 [plus or minus] 0.12 and ([angled bracket]B[angled bracket] - [angled bracket]V[angled bracket])[subscript 0] = 0.75 [plus or minus] 0.02, respectively, values which are consistent with a location near the red edge of the Cepheid instability strip. Space-velocity data for Cr 394 members are needed to strengthen the case for cluster membership of this Cepheid. en_CA
dc.language.iso en en_CA
dc.publisher American Astronomical Society en_CA
dc.relation.uri http://dx.doi.org/10.1086/113830
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 Stars -- Open clusters
dc.title A photometric investigation of cluster membership for the Cepheid BB Sagittarii en_CA
dc.type Text en_CA
dcterms.bibliographicCitation Astronomical Journal 90(7), 1231-1237. (1985) 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/10.1086/113830
 
 

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