Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984aj.....89..231c&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 89, Feb. 1984, p. 231-262.
Astronomy and Astrophysics
Astronomy
29
Cepheid Variables, Globular Clusters, Star Clusters, Stellar Spectrophotometry, Ubv Spectra, Abundance, Interstellar Extinction, Light Curve, Mass To Light Ratios, Red Giant Stars, Spectrum Analysis, Star Distribution, Stellar Evolution
Scientific paper
BV photometry is presented for 48 ab-type and 4 c-type RR Lyrae variables in the globular cluster NGC 3201. The analysis of the reddening across the cluster reveals an irregular distribution with ΔE(B-V) = 0.02 to 0.03 mag. The comparison of the light curve parameters (periods, amplitudes, colors, rise times) for the variables in NGC 3201 and M3 reconfirms the strong similarity of the two clusters. The metal abundance [Fe/H] = -1.4 has been assumed as the most consistent value with the general properties of the cluster. The implications of a larger value of metal abundance, as it is found by high-dispersion spectroscopy of single red giants, are discussed. The helium content has been estimated and the value Y = 0.24±0.03 has been adopted. The mass-luminosity relation log L = 1.83±0.81 log M has been derived. The age of the cluster has been calculated with no indication of it being much different for M3.
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