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

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Title: Galactic clusters with associated Cepheid variables VII: Berkeley 58 and CG Cassiopeiae
Author(s): Turner, David G.; Forbes, Duncan A.; English, D.; Leonard, P. J. T.; Scrimger, J. N.; Wehlau, A. W.; Phelps, R. L.; Berdnikov, L. N.; Pastukhova, E. N.
Abstract: 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 ∼108 yr, a mean reddening of E(B−V) (B0) = 0.70 ± 0.03 s.e. and a distance of 3.03 ± 0.17 kpc (V0−MV= 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(B−V) = 0.64 ± 0.02 s.e. and 〈MV〉=−3.06 ± 0.12 . A possible K supergiant may also be a cluster member.
Publication type: Journal article
Research centre: Swinburne University of Technology. Faculty of Information and Communication Technologies. Centre for Astrophysics and Supercomputing
Source: Monthly Notices of the Royal Astronomical Society, Vol. 388, no. 1 (2008), pp. 444-456
Publication year: 2008
Publisher: Wiley-Blackwell Publishing
ISSN: 0035-8711
Publisher URL: http://dx.doi.org/10.1111/j.1365-2966.2008.13413.x
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