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The RR Lyrae Variables in M54 and the Sgr Dwarf Galaxy

Published online by Cambridge University Press:  03 August 2017

C. Cacciari ,
M. Bellazzini  and
S. Colucci
C. Cacciari
Affiliation:
Osservatorio Astronomico, Via Ranzani 1, 40127 Bologna, Italy
M. Bellazzini
Affiliation:
Osservatorio Astronomico, Via Ranzani 1, 40127 Bologna, Italy
S. Colucci
Affiliation:
Dip. di Astron., Univ. di Bologna, Via Ranzani 1, 40127 Bologna, Italy

Abstract

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We report on new B, V and I CCD photometry of the globular cluster M54 that was aimed at the study of its variable stars. With respect to the previous most recent work on M54 we have nearly doubled the number of detected variable stars: M54 can now be classified as intermediate in the Oosterhoff groups. The metallicity can be estimated for the cluster and field red giant stellar population, and for the variables.

Type
Part 1. The Star Clusters of Local Group Galaxies
Information
Symposium - International Astronomical Union , Volume 207: Extragalactic Star Clusters , 2002 , pp. 168 - 170
Copyright
Copyright © Astronomical Society of the Pacific 2002 

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