A UVBY beta photometric study of RR Lyrae stars. I

Details A UVBY beta photometric study of RR Lyrae stars. I A UVBY beta photometric study of RR Lyrae stars. I

Feb 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982pasp...94..122s&link_type=abstract

Astronomical Society of the Pacific, Publications, vol. 94, Feb. 1982, p. 122-136. Research supported by the Kitt Peak National

Astronomy and Astrophysics

Astronomy

34

Cepheid Variables, Giant Stars, Stellar Models, Stellar Spectrophotometry, Stellar Temperature, Ubv Spectra, Atmospheric Models, Interstellar Extinction, Milky Way Galaxy, Spectral Resolution, Stellar Atmospheres, Stellar Magnitude, Stellar Rotation

Scientific paper

Results of high-phase-resolution uvby beta photometry of RR Lyrae stars are used to derive effective temperatures, surface gravities and mean absolute magnitudes, which are important for the use of RR Lyrae stars as distance indicators within the Galaxy. Dereddening of the data was performed according to the average of E(b-y) over an orbital period, and effective temperatures and surface gravities were derived through the use of color-calibrated atmospheric grids for the metal-poor RRab program stars SU Dra, RX Eri and RR Lyr. Application of the Baade-Wesselink method to the data results in values for the mean absolute magnitudes of these metal-poor stars which average 0.42 magnitudes, which is significantly less than the canonical value of 0.6 magnitudes.

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