The chemical composition of binary and single stars and the signs of accretion of hydrogen and helium from interstellar environment

Young-Woon Kang

Department of Astronomy and Space Science, Sejong University, Korea

During the last years we investigated the chemical compositions of the atmospheres of several binary and single stars, namely ZZ Boo, LX Per, rho Pup and others, and found the signs of accretion of hydrogen and helium from the interstellar or circumstellar environments. It reflects in the correlations of relative chemical abundances of chemical elements with second ionization potentials and with condensation temperatures of these elements. We found these correlations also in the published abundance patterns of other several hundreds stars of different stars, namely in A-F type disk stars and F-G type halo stars. It seems reliable that this type of accretion can strongly influence on the stellar surface chemical composition, and should be taken into account in the explanations of chemical abundance anomalies in the stellar atmospheres.

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