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New Pulsational Constraints to the Distance of Globular Clusters and the MV(RR)–[Fe/H] Relation

Published online by Cambridge University Press:  12 April 2016

Vincenzo Ripepi ,
Filippina Caputo ,
Vittorio Castellani  and
Marcella Marconi
Vincenzo Ripepi
Affiliation:
Osservatorio Astronomico di Capodimonte, Napoli, Italy
Filippina Caputo
Affiliation:
Osservatorio Astronomico di Capodimonte, Napoli, Italy
Vittorio Castellani
Affiliation:
Dipartimento di Fisica, Universitá di Pisa, Italy
Marcella Marconi
Affiliation:
Osservatorio Astronomico di Capodimonte, Napoli, Italy

Abstract

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We applied the pulsational method (Caputo 1997) to derive the distances to a sample of galactic globular clusters with well-observed RR Lyrae populations. To apply the method we calculated a set of pulsational theoretical boundaries of the instability strip for the range of masses and chemical compositions spanned by the analysed clusters. In this way we were able to fix simultaneously the apparent distance modulus and the absolute visual magnitude of the RR Lyrae population of each cluster in the sample. As a result we derived the following relations:

Type
Part 3. Cepheids, RR Lyrae Stars, Distance Scales
Information
International Astronomical Union Colloquium , Volume 176: The Impact of Large-Scale Surveys on Pulsating Star Research , 2000 , pp. 263
Copyright
Copyright © Astronomical Society of the Pacific 2000

References

Caputo, F. 1997, MNRAS, 184, 994 Google Scholar