Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aj....107..622b&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 107, no. 2, p. 622-630
Astronomy and Astrophysics
Astronomy
14
Globular Clusters, Interstellar Extinction, Light Curve, Stellar Color, Stellar Luminosity, Stellar Magnitude, Stellar Mass, Stellar Spectrophotometry, Variable Stars, Charge Coupled Devices, Stellar Temperature
Scientific paper
We present a charge coupled device (CCD) investigation of the light curves of a sample of RR Lyrae in the metal-poor galactic globular cluster NGC 4590 (= M68). Observations were carried out at European Southern Observatory (ESO) in both B and V bands, using the 1.5 m Danish Telescope. Light curves for 21 variables have been derived, giving pulsational amplitude together with mean magnitudes and colors for a subsample of 17 variables. Comparison of the period-amplitude relation with the similar relation for variables in M15 shows a close similarity between the two clusters. The color-period relation supports previous suggestions for a M15 reddening larger than that of M68 by about delta-E(B - V) = 0.04. Effective temperatures for M68 pulsators have been derived under selected assumptions about the cluster reddening. Adopting currrent evaluation for this reddening (E(B - V) approximately = 0.03) one finds that the RR Lyrae in this metal-poor globular do not show any period shift to M3, as required by the current evolutionary scenario. The mass-luminosity ratio of the cluster variables is finally discussed, also in connection with recent estimates of such a paramenter in M15.
Brocato Enzo
Castellani Vittorio
Ripepi Vincenzo
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