Physics
Scientific paper
Sep 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984phdt.........3n&link_type=abstract
Ph.D. Thesis Washington Univ., Seattle.
Physics
6
Magellanic Clouds, Star Clusters, Stars, Abundance, Hertzsprung-Russell Diagram, Photometry, Stellar Luminosity
Scientific paper
RR Lyrae stars in and around the LMC halo globular cluster NGC 2257 were identified and photometrically studied. The Fe/H was derived and was found to be -1.8 + or - 0.3. Mean magnitudes suggest that NGC 2257 is approximately 4 Kpc in front of the LMC disk. Period change rates, derived for 38 stars from observations spanning nearly 35 years, are significantly different for the ab- and c-type stars. The identification of two large amplitude, short period RRab stars suggests that the field around NGC 2257 contains stars of higher Fe/H than does the cluster. Ten double-model RR Lyrae (RRd) stars were identified in the Draco dwarf galaxy. Heat mass and metal abundance ranges were found. Real star-to-star luminosity variations are seen among the Draco RR Lyraes, and evidence for a global metal abundance range among the RR Lyraes is presented. The mean periods of the Blazhko amplitude variables in Draco and in six Galactic globular clusters are shown to be significantly shorter than the mean periods of the non-Blazhko variables in the same systems.
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