Mean colours of RR Lyrae stars in galactic globular clusters : a preliminary report.
Abstract
Magnitudes and colors of a wide sample of RR Lyrae stars in 10 galactic globular clusters belonging to the two different Oosterhoff groups have been analyzed. Relations among periods, amplitudes, luminosities, and temperatures have been derived for each cluster. A preliminary comparison of the data with the theoretical models confirms essentially the results discussed by Sandage (1981). However, a weak indication that the slope of the logP(f)-logT(eff) relation may differ significantly for some clusters from the theoretically expected value of -3.48 is found.
- Publication:
-
Memorie della Societa Astronomica Italiana
- Pub Date:
- 1985
- Bibcode:
- 1985MmSAI..56...97C
- Keywords:
-
- Cepheid Variables;
- Globular Clusters;
- Light Curve;
- Stellar Color;
- Stellar Magnitude;
- Astronomical Models;
- Mass To Light Ratios;
- Metallicity;
- Stellar Temperature;
- Astrophysics