Abstract
Estimates of the pulsation massesM Q and of massesM g=gR2/G (g is the surface gravity;R, the mean stellar radius; andG, the gravitational constant) of 89 Delta Scuti-variables have been obtained. An intercomparison of three kinds of masses —M e, Mg, andM Q — is performed; the evolutionary massesM e of the same variables were estimated in a previous paper (Tsvetkov, 1986). It is pointed out that within the limits of the accuracy of determination, the three kinds of masses agree for the majority of the stars under study. For several varaibles, however, there is a considerable discrepancy between the estimates of the pulsation massesM Q and the estimates of the massesM e andM g. Arguments are represented, which may alleviate or even remove this mass discrepancy for some of these stars. It is shown that the results from the comparison between the three kinds of masses of the considered Delta Scuti-stars are not very sensitive to the choice of the system of evolutionary tracks and the adopted chemical composition as well as to the evolutionary phases of the variables (core or shell hydrogen burning). The variations of the chemical composition in most of the stars under study are probably not very large.
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Tsvetkov, T.G. Comparison between the masses of Delta Scuti-variables. Astrophys Space Sci 173, 1–12 (1990). https://doi.org/10.1007/BF00642557
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DOI: https://doi.org/10.1007/BF00642557