Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007iaus..240..333g&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
γ Per looks like an unexceptional composite-spectrum binary,most often classified as G8 III + A3 V. Nevertheless, early studies indicated that the masses of the component stars were on the high side, until Popper showed that the component stars were not over- massive so much as over-luminous. Pourbaix then went further, constraining the masses on the basis of evolutionary theory and largely removing any discrepancies in mass. However, recent CCD spectroscopy, from which the secondary spectrum has been fully isolated by a spectrum subtraction technique, finds that the masses of the individual components (3.9 M(sun) for the giant and 2.5 M(sun) for the dwarf) are indeed greater than would be expected from their spectral types, thus re-opening the question of the origin and evolution of this somewhat unusual system. Analyses of more than 25 composite-spectrum systems by spectrum subtraction have now produced enough results that a picture is beginning to emerge - and it is an unexpected one: like gamma Per, many other systems also have secondary stars that have started evolving away from the main-sequence, thus challenging us to explain how the two stars can have attained that state of rapid evolution and yet be of the same age. The importance of the new analysis of gamma Per is the high precision with which the observed stellar parameters of one of these systems can be determined.
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