Anchors for the cosmic distance scale: the Cepheids U Sagittarii, CF Cassiopeiae, and CEab Cassiopeiae
- Majaess, D.
- Carraro, G.
- Moni Bidin, C.
- Bonatto, C.
- Berdnikov, L.
- Balam, D.
- Moyano, M.
- Gallo, L.
- Turner, D.
- Lane, D.
- Gieren, W.
- Borissova, J.
- Kovtyukh, V.
- Beletsky, Y.
Publication date
November 2013
DOI ISSN
0004-6361 Citation count (estimate)
10Abstract
New 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 \ub1 25 pc and 3.40 \ub1 0.15 kpc, respectively.Peer reviewed: YesNRC publication: Ye
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