Abstract
Luminosities of Population I pulsating stars (Delta Scuti variables and classical cepheids) are investigated. From data for 80 Delta Scuti stars, semi-empirical period-luminosity-colour (P-L-C) relations and period-luminosity (P-L) relations are obtained for the four lowest modes of radial pulsations. The improvement of the accuracy of the stellar luminosity is determined when a P-L-C relation is used instead of the corresponding P-L relation. From data for 155 classical cepheids, empirical P-L relations are derived for short-period stars (logP≤1.1), long-period stars (logP>1.1), and s-cepheids. The comparison of the P-L relations for the two types of variable stars shows good agreement, but between them there is a ‘gap’ with a dim nature.
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Tsvetkov, T.G. Population I pulsating stars. Astrophys Space Sci 117, 227–243 (1985). https://doi.org/10.1007/BF00650149
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DOI: https://doi.org/10.1007/BF00650149