Journal Article

Galactic clusters with associated Cepheid variables – VII. Berkeley 58 and CG Cassiopeiae

D. G. Turner, D. Forbes, D. English, P. J. T. Leonard, J. N. Scrimger, A. W. Wehlau, R. L. Phelps, L. N. Berdnikov and E. N. Pastukhova

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 388, issue 1, pages 444-456
Published in print July 2008 | ISSN: 0035-8711
Published online July 2008 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2008.13413.x
Galactic clusters with associated Cepheid variables – VII. Berkeley 58 and CG Cassiopeiae

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Photoelectric, photographic and CCD UBV photometry, spectroscopic observations and star counts are presented for the open cluster Berkeley 58 to examine a possible association with the 4.37 d Cepheid CG Cas. The cluster is difficult to separate from the early-type stars belonging to the Perseus spiral arm, in which it is located, but has reasonably well-defined parameters: an evolutionary age of ∼108yr, a mean reddening of E(BV) (B0) = 0.70 ± 0.03 s.e. and a distance of 3.03 ± 0.17 kpc (V0MV= 12.40 ± 0.12 s.d.). CG Cas is a likely cluster coronal member on the basis of radial velocity, and its period increase of +0.170 ± 0.014 s yr−1 and large light amplitude describe a Cepheid in the third crossing of the instability strip lying slightly blueward of strip centre. Its inferred reddening and luminosity are E(BV) = 0.64 ± 0.02 s.e. and 〈MV〉=−3.06 ± 0.12. A possible K supergiant may also be a cluster member.

Keywords: stars: evolution; Cepheids; open clusters and associations: individual: Berkeley 58

Journal Article.  7371 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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