RR Lyrae variables in Galactic globular clusters: IV. Synthetic HB and RR Lyrae predictions

Abstract

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 Z=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 Z greater or equal than 0.001. Predictions concerning the parameter R are also discussed and compared under various assumptions about the horizontal branch reference luminosity level.

arXiv comment11 pages, 10 figures. Accepted for publication in "Astronomy and Astrophysics"

References in corpus (19)

• Dwarf Galaxies of the Local Group
• Line formation in solar granulation: IV. [O I], OI and OH lines and the photospheric O abundance
• The giant, horizontal and asymptotic branches of galactic globular clusters. I. The catalog, photometric observables and features
• A Globular Cluster Metallicity Scale Based on the Abundance of Fe II
• A pulsational approach to near infrared and visual magnitudes of RR Lyrae stars
• The initial Helium content of Galactic Globular Cluster stars from the R-parameter: comparison with the CMB constraint
• Astrometry with Hubble Space Telescope: A Parallax of the Fundamental Distance Calibrator RR Lyrae
• A critical investigation on the discrepancy between the observational and theoretical Red Giant luminosity function "Bump"
• Un updated theoretical scenario for globular cluster stars
• Theoretical insights into the RR Lyrae K-band Period-Luminosity relation
• RR Lyrae stars in Galactic globular clusters. II. A theoretical approach to variables in M3
• The Metallicity Dependence of RR Lyrae Absolute Magnitudes from Synthetic Horizontal-Branch Models
• The Evolutionary Status of M3 RR Lyrae Variables: Breakdown of the Canonical Framework?
• On the helium content of Galactic globular clusters via the R parameter
• The Carina Project: I. Bright Variable Stars
• RR Lyrae variables in Galactic globular clusters - I: The observational scenario
• A Catalog of Helium Abundance Indicators from Globular Cluster Photometry
• RR Lyrae variables in M5 as a test of pulsational theory
• Nuclear burning rates and population II stellar models

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