Highlights on eclipsing binary variables from Araucaria Project

Abstract

The Araucaria Project, which main goal is to provide precise determination of the cosmic distance scale, has recently made a set of discoveries involving variable stars in binary systems. Among these discoveries we highlight three: 1% precise measurement of a Cepheid's dynamical mass and its projection factor, accurate determination of both stellar and orbital parameters of eclipsing binary consisting of two Cepheid variables, and discovery of new class of variable stars, mimicking RR Lyrae pulsators.

Keywords

• stars: Cepheids
• stars: pulsation
• stars: pulsation
• stars: eclipsing binaries
• stars: distances
• stars: oscillations