Proposal: P01_08

Robert Szabo, Konkoly Observatory, Hungary

Cepheids

Abstract:

We propose to observe Cepheids with the Kepler satellite. These pulsating, Pop. I. supergiant stars are important cosmic distance indicators, thanks to the well-known period-luminosity relation. Due to their long period (1-100 days), homogeneous and continuous monitoring via ground-based facilities is rather difficult. Using Kepler photometry we will be able to address important questions, like light-curve stability, existence of ultra-low amplitude pulsation, second and higher overtone radial, putative nonradial, as well as strange modes. The results should give invaluable constraints to existing theories and future models concerning evolutionary status, driving mechanism, chemical composition, and mass-luminosity relation.