The comparable analysis of the Cepheids and non-variable supergiants from the instability strip.I |
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Authors: | Sergei M. Andrievsky Valery V. Kovtyukh |
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Affiliation: | (1) Department of Astronomy, Odessa State University, Shevchenko Park, 270014 Odessa, Ukraine |
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Abstract: | The elemental abundances, temperatures, gravities and microturbulence velocities were derived for 14 non-variable supergiants from the Cepheids' instability strip and two hotter supergiants. For 8 stars the abundances were determined for the first time. The comparable analysis of the program stars' chemical composition and that of the small-amplitude Cepheids has shown that there is no essential differences in the elemental abundances for two stellar groups. Some discussion of the phenomenon of non-variable supergiants in the instability strip is given. |
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