The masses of AC Andromedae, U Trianguli Australis, and BC Draconis

Astronomy and Astrophysics – Astrophysics

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Cepheid Variables, Pulsed Radiation, Stellar Luminosity, Stellar Mass, Radii, Stellar Evolution, Stellar Models, Stellar Temperature

Scientific paper

Special calculations in the framework of linear radial-pulsation theory are performed to derive masses that closely match the observed periods of the double-mode variables AC And, U TrA, and BC Dra. Purely radiative models are constructed for varying mass, effective temperature, luminosity, and composition, with the effective-temperature range corresponding to the observed pulsational-instability strip. A number of models which include 'frozen-in' convection in the mixing-length approximation are also considered, and several models are computed at effective-temperature values near the red edge of the instability strip. The results indicate that AC And may be a high-luminosity Delta Scuti star since its mass is too large for an ordinary RR Lyrae star, that U TrA must be cooler than 6400 K, and that the temperature of BC Dra cannot be higher than about 5700 K to have a second-order pulsational instability in terms of the linear theory. It is noted that the derived mass of BC Dra is only seven-tenths that given by stellar evolution theory.

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