Delta Scuti variables. II. DY Her (Milone+, 1994)

Physics

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Stars: Variable, Photometry: Ubvrijklmnh

Scientific paper

This is the second paper in a series on large-amplitude delta Scuti stars intended to determine Baade-Wesselink radii and luminosities with precision. The first paper (Wilson et al., 1993PASP..105..809W) discussed our method of analysis and its application to EH Librae; in this we discuss the observations and analysis of DY Herculis. Optical and infrared photometry and cross-correlated radial-velocity data have been obtained and analyzed. Fourier representations for the UBVRIJHK light curves and for the radial-velocity curves were used to derive a value for the minimum radius for each of 60 combinations of flux and color index. From these we adopt a mean value for the minimum radius of Rmin=2.77+/-0.20R&sun;. When combined with effective temperatures from Breger et al. (1978PASP...90..754B), we find a mean bolometric luminosity of =21.70L&sun; and a mean absolute magnitude of =1.41. The radial excursion is 0.149R&sun;. We use the same procedure to improve our results for EH Librae, deriving Rmin for each of 42 combinations of flux and color index, and obtain mean values of Rmin=2.62+/-0.19R&sun;, =24.56L&sun; and =1.27. (3 data files).

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