Studies of Large‐Amplitude δ Scuti Variables. III. DY Pegasi
| Autor: | Eugene F. Milone, D. J. I. Fry, W. J. F. Wilson, J. van Leeuwen |
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| Rok vydání: | 1998 |
| Předmět: | |
| Zdroj: | Publications of the Astronomical Society of the Pacific. 110:433-450 |
| ISSN: | 1538-3873 0004-6280 |
| Popis: | This is the third in a series of papers on large-amplitude δ 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 δ 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 Rmin = 2.09±0.25 R⊙. When combined with effective temperatures from Burki & Meylan, we find a mean bolometric luminosity of Lbol = 11.34 L⊙ and a mean absolute magnitude of Mbol = 2.11. The radial excursion (Rmax-Rmin) is 0.073 R⊙. |
| Databáze: | OpenAIRE |
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