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1973•International Astronomical Union ColloquiumOpen access

On the Interpretation of RR Lyrae Properties in Globular Clusters and in Other Population II Systems

V. Castellani, P. Giannone, A. Renzini

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Abstract

Abstract The differences in observational parameters of the RR Lyrae variables and horizontal branch stars of globular clusters and other population II systems are considered. A discontinuous behaviour of some parameters is outlined. The Oosterhoff dichotomy and the HB morphology are discussed with regard to a conjecture of mass loss in the pre-HB phase.

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Abstract The differences in observational parameters of the RR Lyrae variables and horizontal branch stars of globular clusters and other population II systems are considered. A discontinuous behaviour of some parameters is outlined. The Oosterhoff dichotomy and the HB morphology are discussed with regard to a conjecture of mass loss in the pre-HB phase.

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Available abstract

Abstract The differences in observational parameters of the RR Lyrae variables and horizontal branch stars of globular clusters and other population II systems are considered. A discontinuous behaviour of some parameters is outlined. The Oosterhoff dichotomy and the HB morphology are discussed with regard to a conjecture of mass loss in the pre-HB phase.

Key concepts: RR Lyrae variable, Globular cluster, Horizontal branch, Astrophysics, Conjecture, Population, Interpretation (philosophy), Physics

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