1996/05/23 by G. Bono, Giuseppe Bono, R. Incerpi +3 · 1 citation
Physics and Astronomy · #Pulsars and Gravitational Waves Research #Scientific Research and Discoveries #Stellar, planetary, and galactic studies #astro-ph
paper · pdf · doi:10.1086/310207
postscript file of 14 pages and 4 figures; for any problem please write to [email protected]
arxiv created 1996/05/23 · openalex publication_date 1996/08/20 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/31
Since the seminal paper of Preston, the existence of a metal-rich component among the RR Lyrae variable stars belonging to the solar neighborhood has become a well-known observational fact. In this investigation the effects of heavy-element abundance on theoretical observables is studied for both fundamental and first-overtone pulsators at fixed mass ( M / M ☉ = 0.53) and luminosity level [log ( L / L ☉ ) = 1.51]. In order to cover the observed range of RR Lyrae metallicity, the nonlinear models have been computed by adopting three different metal contents ( Z = 0.0001, 0.001, and 0.02). It has been found that the bolometric amplitude of first-overtone pulsators decreases as the metallicity increases, whereas for fundamental pulsators the amplitude is positively correlated with the metal abundance.