Anchors for the cosmic distance scale: the Cepheids U Sagittarii, CF Cassiopeiae, and CEab Cassiopeiae

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DOIResolve DOI: http://doi.org/10.1051/0004-6361/201322670
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TypeArticle
Journal titleAstronomy and Astrophysics
ISSN0004-6361
Volume560
Article numberA22
SubjectDistance scale; Hertzsprung-Russell and C-M diagrams; Multiband analysis; Star clusters; Stars: variables: Cepheids; Visual binaries
AbstractNew and existing X-ray, UBVJHKsW(1 - 4), and spectroscopic observations were analyzed to constrain fundamental parameters for M 25, NGC 7790, and dust along their sight-lines. The star clusters are of particular importance because they host the classical Cepheids U Sgr, CF Cas, and the visual binary Cepheids CEa and CEb Cas. Precise results from the multiband analysis, in tandem with a comprehensive determination of the Cepheids' period evolution (dP/dt) from ~140 years of observations, helped to resolve concerns raised regarding the clusters and their key Cepheid constituents. Specifically, the distances derived for members of M 25 and NGC 7790 are 630 ± 25 pc and 3.40 ± 0.15 kpc, respectively.
Publication date
LanguageEnglish
AffiliationNational Research Council Canada (NRC-CNRC); National Science Infrastructure
Peer reviewedYes
NPARC number21270974
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Record identifierfffdf83f-efeb-4343-9f37-814c11e373f9
Record created2014-02-18
Record modified2016-05-09
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