Physical Characteristics for the RR Lyrae Stars in the LMC clusters NGC 2210 and NGC 2257

Details Physical Characteristics for the RR Lyrae Stars in the LMC clusters NGC 2210 and NGC 2257 Physical Characteristics for the RR Lyrae Stars in the LMC clusters NGC 2210 and NGC 2257

Aug 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007noao.prop...60n&link_type=abstract

NOAO Proposal ID #2007B-0060

Physics

Scientific paper

NGC 2210 and NGC 2257 are both RR Lyrae-rich globular clusters located in the eastern halo of the Large Magellanic Cloud. NGC 2257 is unique in having been monitored reasonably continuously since the early 1950's. We propose to acquire new B,V CCD photometry that will be combined with extant photographic and CCD photometry and used to derive accurate physical characteristics for the ~40 RR Lyrae stars in each cluster. Specifically, we plan: (a) to complete the job of determining pulsation periods, amplitudes, mean colors and mean magnitudes for the uncrowded RR Lyrae stars in both clusters; (b) to derive period change rates for the NGC 2210 stars (unknown at present), and to derive dP/dt values more accurate than +/-0.02 d/Myr for the NGC 2257 stars; (c) to derive accurate Fourier decomposition coefficients for all the variable stars; and (d) to use the Fourier data to derive effective temperatures, luminosities, and masses via comparison with modern theoretical models for horizontal branch stars. Our overall goal is to analyse new extensive two-color photometry in combination with existing B,V photometry to better understand the evolution of the RR Lyrae stars in these two important clusters.

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