Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007iaus..240..460g&link_type=abstract
Binary Stars as Critical Tools and Tests in Contemporary Astrophysics, International Astronomical Union. Symposium no. 240, he
Astronomy and Astrophysics
Astrophysics
Scientific paper
Binary stars of the zeta Aurigae type (eclipsing systems containing a cool giant plus a hot main-sequence star) offer our only method of probing a stellar chromosphere. Close to occultation, the dwarf acts as a light probe behind the giant's chromosphere, enabling an observer to detect changing conditions in that chromosphere along the line of sight. The technique is powerful, the effects dramatic (as will be illustrated). However, presently known eclipsing systems number only about 10, and a much greater sample is required for meaningful statistics of the properties of stellar chromospheres. New surveys of fainter binaries should be investigated for eclipses in order to extend the sample size and gain more information on chromospheres in general. Such information is clearly vital for modelling stellar photospheres, from which abundances are derived. The paper describes the very different behaviour of chromospheric material in two 3^rd-magnitude binaries.
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