期刊
ASTRONOMY & ASTROPHYSICS
卷 560, 期 -, 页码 -出版社
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201322670
关键词
stars: variables: Cepheids; Hertzsprung-Russell and C-M diagrams
资金
- Russian Foundation for Basic Research [13-02-00203]
- BASAL Centro de Astrofisica y Tecnologias Afines (CATA) [PFB-06/2007]
- Ministerio da Ciencia, Tecnologia, e Inovacao (MCTI) da Republica Federativa do Brasil [CN2013A-157]
- US National Optical Astronomy Observatory (NOAO) [CN2013A-157]
- University of North Carolina at Chapel Hill (UNC) [CN2013A-157]
- Michigan State University (MSU) [CN2013A-157]
New and existing X-ray, UBVJHK(s)W((1-4)), and spectroscopic observations were analyzed to constrain fundamental parameters for M25, NGC 7790, and dust along their sight-lines. The star clusters are of particular importance because they host the classical Cepheids USgr, 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 similar to 140 years of observations, helped to resolve concerns raised regarding the clusters and their key Cepheid constituents. Specifically, the distances derived for members of M25 and NGC7790 are 630 +/- 25 pc and 3.40 +/- 0.15 kpc, respectively.
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