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Title:
Theoretical model of red variables in globular clusters
Authors:
Perl, M.; Tuchman, Y.
Affiliation:
AA(Jerusalem, Hebrew University, Israel), AB(Jerusalem, Hebrew University, Israel)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 360, Sept. 10, 1990, p. 554-560. (ApJ Homepage)
Publication Date:
09/1990
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
Globular Clusters, Mira Variables, Red Giant Stars, Stellar Models, Stellar Interiors, Stellar Luminosity, Stellar Oscillations
DOI:
10.1086/169144
Bibliographic Code:
1990ApJ...360..554P

Abstract

The common procedure of using the pulsation constant as a tool for the determination of the dominant mode of pulsation in Mira variables is shown to include a large uncertainty. An alternative way based on theoretical mapping of a luminosity-period relation, which is compared with the well-determined observations of these parameters, is presented. It is shown that the peculiar features of the observed distribution of Miras variables in the period-luminosity plane, for Tuc 47, are distinct enough to enable a clear and a definite selection of the dominant mode in these variables - the second overtone for red semiregulars and the first overtone for Miras variables. These results are also confirmed by detailed nonlinear calculations, some of which are presented as well.

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