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The Period-Luminosity Relation for Cepheids in Globular Clusters

Published online by Cambridge University Press:  12 April 2016

B. V. Kukarkin  and
A. S. Rastorgouev
B. V. Kukarkin
Affiliation:
Sternberg Astronomical Institute, U.S.S.R.
A. S. Rastorgouev
Affiliation:
Sternberg Astronomical Institute, U.S.S.R.

Extract

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The period-luminosity relation for Cepheids in globular clusters has been investigated many times (e.g. Fernie, 1964; Kwee, 1968; Frolov, 1970; Demers, 1971).

The method of determination of the apparent distance moduli was recently revised by Kukarkin and Russev (1972). Instead of using a single absolute magnitude for RR Lyrae variables, the magnitudes according to pulsation theory (Christy, 1966, 1971) were adopted. The inhomogeneity of the absolute magnitudes of the RR Lyrae variables had already been established long ago (Pavlovskaya, 1953), but it attracted attention only recently. The different methods for determining the distance moduli of globular clusters were calibrated according to the new absolute magnitudes of the RR Lyrae variables. The problem consisted in the determination of the absolute magnitudes of the Cepheids in globular clusters according to the apparent distance moduli.

Type
Part III / Slow Variables in Population II Systems
Information
International Astronomical Union Colloquium , Volume 21: Variable Stars in Globular Clusters and in Related Systems , August 1973 , pp. 180 - 184
Copyright
Copyright © Reidel 1973

References

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