Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...289..394c&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 289, no. 2, p. 394-396
Astronomy and Astrophysics
Astrophysics
18
Globular Clusters, Horizontal Branch Stars, Stellar Evolution, Stellar Models, Chronology, Morphology, Variable Stars
Scientific paper
It has been argued in the recent literature that the horizontal-branch (HB) evolutionary tracks of Castellani, Chieffi, & Pulone (1991) are superior to those of Lee & Demarque (1990) in accounting for the properties of RR Lyrae variables in Galactic globular clusters (GGCs). In the present study, we show that the conclusions reached by Catelan & de Freitas Pacheco (1993) on the role played by age as a second parameter affecting the HB morphologies of the GGCs NGC 288 and NGC 362, originally based upon the analysis of the latter tracks, are confirmed when the Castellani et al. set is employed instead. More specifically, we confirm that an age difference between these clusters as small as approximately 2-3 Gyr can only be consistent with HB models if additional parameters are varying between them, and/or both clusters are younger than approximately 10 Gry, and/or stellar evolution at the core He-burning phase is not properly understood.
Catelan Márcio
de Freitas Pacheco José Antonio
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