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.
Highlights
The Araucaria project is a long-term observational program which aims to provide an improved local calibration of the extragalactic distance scale
Standard candles in eclipsing binary systems are of particular interest, as they provide both orbital and stellar parameters of high accuracy, which may have an impact upon the theory of stellar pulsation and evolution
The following is the summary of selected results recently obtained by the Araucaria project, focused on pulsating variables in binary systems
Summary
The Araucaria project is a long-term observational program which aims to provide an improved local calibration of the extragalactic distance scale. An application of a number of different stellar standard candles (Cepheid variables, RR Lyrae stars, red clump giants, and blue supergiants) allows to independently determine distances to nearby galaxies. Standard candles in eclipsing binary systems are of particular interest, as they provide both orbital and stellar parameters of high accuracy, which may have an impact upon the theory of stellar pulsation and evolution.
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