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

Turner, D.G. and Forbes, D.W. and English, D. and Leonard, P.J.T. and Scrimger, J.N. and Wehlau, A.W. and Phelps, R.L. and Berdnikov, L.N. and Pastukhova, E.N. (2008) Galactic clusters with associated Cepheid variables – VII. Berkeley 58 and CG Cassiopeiae. Monthly Notices of the Royal Astronomical Society, 388 (1). pp. 444-456. ISSN 1365-2966

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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 ~10 8 yr, a mean reddening of E(B - V)(B0)= 0.70 ± 0.03 s.e. and a distance of 3.03 ± 0.17 kpc (V 0-M V = 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 〈 M V 〉 =-3.06 ± 0.12. A possible K supergiant may also be a cluster member.

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