2004/07/13 by S. Cassisi, M. Castellani, F. Caputo +1 · 1 citation
Physics and Astronomy · #Astro and Planetary Science #Astrophysics #Astrophysics and Star Formation Studies #Biology #Concordance #Galaxy #Globular cluster #Horizontal branch #Luminosity #Metallicity #Physics #RR Lyrae variable #Stars #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.1051/0004-6361:20041048
published as Astron.Astrophys. 426 (2004) 641-650 · 11 pages, 10 figures. Accepted for publication in "Astronomy and Astrophysics"
arxiv created 2004/07/13 · openalex publication_date 2004/10/11 · arxiv updated 2009/12/01 · openalex created_date 2022/10/02 · openalex updated_date 2026/07/31
We present theoretical predictions concerning horizontal branch stars in globular clusters, including RR Lyrae variables, as derived from synthetic procedures collating evolutionary and pulsational constraints. On this basis, we explore the predicted behavior of the pulsators as a function of the horizontal branch morphology and over the metallicity range 0.0001 to 0.006, revealing an encouraging concordance with the observed distribution of fundamentalised periods with metallicity. Theoretical relations connecting periods to K magnitudes and BV or VI Wesenheit functions are presented, both appearing quite independent of the horizontal branch morphology only with 0.001. Predictions concerning the parameter R are also discussed and compared under various assumptions about the horizontal branch reference luminosity level.