CCD Photometry of RR Lyrae Stars in M5 as a Test for the Pulsational Scenario

Abstract

view Abstract Citations (27) References (26) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS CCD Photometry of RR Lyrae Stars in M5 as a Test for the Pulsational Scenario Brocato, E. ; Castellani, V. ; Ripepi, V. Abstract In this paper we present a new CCD based investigation of RR Lyrae pulsators in the Oo. I globular cluster M5. We confirm the variability of 11 Gerashchenko (1987) objects, adding the evidence for further 15 variables in the central region of the cluster. BV light curves for 15 RR Lyrae are presented. With the addition of further 11 light curves by Storm et al. [PASP, 103, 1264 (1991)] one is dealing with a sample of 26 well-studied cluster pulsators. The data for these stars have been combined with similar data for RR Lyrae in clusters M3, M 15, and M68 to allow a comparison with the theoretical scenario recently presented by Bono & Stellingwerf [ApJS, 93, 233 (1994)]. On this basis, we discuss the distribution of stars in the period amplitude diagram, disclosing a substantial reduction of Sandage's period shift. We suggest that theoretical constraints concerning periods and amplitudes could allow information on masses and luminosity of the pulsators to be derived directly from the Bailey diagram. Static temperatures have been derived for all stars in the sample, and we discuss the dependence on the temperature of the observed pulsational properties. Publication: The Astronomical Journal Pub Date: February 1996 DOI: 10.1086/117827 arXiv: arXiv:astro-ph/9505112 Bibcode: 1996AJ....111..809B Keywords: GLOBULAR CLUSTERS: INDIVIDUAL: M5; STARS: OSCILLATIONS; STARS: VARIABLES: RR LYRAE; Astrophysics E-Print: postscript file of 17 pages of text plus 7 figures and 2 tables. For any problem please write to vincenzo@astr1pi.difi.unipi.it full text sources arXiv | ADS | data products SIMBAD (59)