This is the third in a series of papers on large-amplitude d Scuti and related stars intended to determine Baade-Wesselink radii and luminosities with precision. The first two papers discussed our method of analysis and its application to the d Scuti variables EH Librae and DY Herculis; in the present paper we discuss the observations and analysis of the SX Phoenicis variable DY Pegasi. Optical (BVI) and infrared (JH) photometry and cross-correlated radial velocity data have been obtained and analyzed. Fourier representations for the BVIH light curves and for the radial velocity curve were used to derive a value for the minimum radius for each of 22 combinations of flux and color index, from which we obtain a mean value for the minimum radius of R , . When combined with effective temperatures from Burki & Meylan, we find a mean R ϭ 2.09 ע 0.25 min bolometric luminosity of L , and a mean absolute magnitude of . The radial excursion AL S ϭ 11.34 AM S ϭ 2.11 bol bol ( ) is 0.073 R , .
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