BV photometry of RR Lyrae variables in the globular cluster M 5

Details BV photometry of RR Lyrae variables in the globular cluster M 5 BV photometry of RR Lyrae variables in the globular cluster M 5

Dec 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991pasp..103.1264s&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 103, Dec. 1991, p. 1264-1278. Research supported by SNF

Astronomy and Astrophysics

Astronomy

45

Globular Clusters, Light Curve, Stellar Spectrophotometry, Variable Stars, Charge Coupled Devices, Color-Magnitude Diagram, Metallicity, Stellar Color, Stellar Magnitude

Scientific paper

BV CCD photometry for eleven RR Lyrae variables in the globular cluster M 5 (NGC 5904) is presented. New ephemerides are computed, and V, B, and (B-V) light curves are given. A color-magnitude diagram based on two V and two B short-exposure frames is given, which reaches from the tip of the giant branch to below the main-sequence turnoff. The RRab and RRc variables overlap in mean (B-V) colors, but not in effective temperatures computed using periods, blue amplitudes, and the metallicity of the clusters. This supports a previous claim about the unsuitability of mean (B-V) values to estimate mean or equilibrium temperatures for RR Lyrae stars.

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