Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995aj....110.2200c&link_type=abstract
Astronomical Journal v.110, p.2200
Astronomy and Astrophysics
Astronomy
11
Globular Clusters: Individual: Ngc 2298, Stars: Variables: Rr Lyrae
Scientific paper
CCD observations have been used to determine precise light curves for the three known RR Lyrae variables in the globular cluster NGC 2298 and to search for additional variables. One new RR Lyrae variable has been discovered. Masses, luminosities, and temperatures have been derived for the two RRc stars in the cluster by the method of Simon that relates these quantities to the pulsation period and the Fourier phase parameter φ31. These quantities have been compared with the values for M3, an Oosterhoff type I cluster with a metal abundance similar to that of NGC 2298. The comparison indicates that the RRc stars in NGC 2298 are more luminous, less massive and cooler than those in M3. This result gives support to Lee, Demarque, and Zinn's hypothesis that the RR Lyrae variables in Oosterhoff type II clusters have evolved away from the ZAHB while those in the type I clusters are ZAHB stars. However, since there are only two RRc stars in NGC 2298, the hypothesis must be tested with observations of RRc stars in more clusters.
Bezaire Jeffrey
Clement Christine M.
Giguere Denise
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