Open AccessRR Lyrae variables in M5 as a test of pulsational theory
Author(s) -
Caputo F.,
Castellani V.,
Marconi M.,
Ripepi V.
Publication year - 1999
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1046/j.1365-8711.1999.02561.x
Subject(s) - rr lyrae variable , physics , photometry (optics) , astrophysics , variable star , light curve , horizontal branch , instability strip , astronomy , globular cluster , cepheid variable , stars
We present B and V CCD photometry for variables in the cluster central region, adding new data for 32 variables and giving suitable light curves, mean magnitudes and corrected colours for 17 RR Lyrae variables. Adding the data given in this paper to similar data that have already appeared in the literature, we discuss a sample of 42 variables, as given by 22 RR ab and 20 RR c , in the light of recent predictions from pulsational theories. We find that the observational evidence concerning M5 pulsators appears in marginal disagreement with predictions concerning the colour of the first overtone blue edge (FOBE), whereas a clear disagreement appears between the zero‐age horizontal branch (ZAHB) luminosities predicted through evolutionary and pulsational theories.