Details

Autor(en) / Beteiligte

• 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.

Titel

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

Ist Teil von

• Astronomy and astrophysics (Berlin), 2013-12, Vol.560, p.np-np

Ort / Verlag

EDP Sciences

Erscheinungsjahr

2013

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• 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 ± 25 pc and 3.40 ± 0.15 kpc, respectively.