Stromgren photometry of MACHO delta Scuti stars in the Galactic Bulge

Details Stromgren photometry of MACHO delta Scuti stars in the Galactic Bulge Stromgren photometry of MACHO delta Scuti stars in the Galactic Bulge

Feb 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999noao.prop..204t&link_type=abstract

NOAO Proposal ID #1999A-0204

Physics

Scientific paper

Delta Scuti stars are early (A-F) main (or early post-main) sequence stars, so their presence in nominally old stellar populations like the Bulge and globular clusters means they may either be of extremely low metallicity or may have formed recently as a result of binary star interaction or mergers. A determination of their properties will allow us to investigate these objects in great detail with our numerical models. We will use the 1.5m telescope at CTIO to obtain 6-color Stromgren photometry of selected delta Scuti stars found in the Galactic Bulge by the MACHO Survey. We will then use this photometry to determine the abundances, temperatures, and surface gravities of these objects. This information will be used in our theoretical program to study the pulsations of these objects. Determinations of these stellar parameters will allow us to produce more precise fits of our theoretical models to observed stars.

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