Absolute Photometry of RR Lyrae Stars in the LMC

Details Absolute Photometry of RR Lyrae Stars in the LMC Absolute Photometry of RR Lyrae Stars in the LMC

Aug 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006noao.prop..492k&link_type=abstract

NOAO Proposal ID #2006B-0492

Computer Science

Databases

Scientific paper

RR Lyrae variables play an important role in the determination of distances to older stellar populations in the Milky Way and neighboring galaxies. The MACHO and OGLE projects have identified several thousand RR Lyraes in the LMC. We propose to obtain accurate photometry of a subsample of ~ 600 RR Lyrae. This data will be used to check the calibration of the MACHO and OGLE photometric databases and will be used by us to make multi-slit masks for spectra to be taken with the Southern African Large Telescope. The new photometry combined with the spectroscopic observations will allow for accurate estimates of the average magnitudes, the local reddening, the luminosity-metallicity relation, and the distance to the LMC. A thorough and accurate study of RR Lyrae stars in the inner bar and outer part of the LMC will allow us to explore the structure of the older stellar population in the LMC and will be used to constrain star formation and chemical evolution models of the LMC.

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