The separation of isotopes of chemical elements in the atmospheres of CP stars due to light-induced drift

Details The separation of isotopes of chemical elements in the atmospheres of CP stars due to light-induced drift The separation of isotopes of chemical elements in the atmospheres of CP stars due to light-induced drift

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007smma.conf..220s&link_type=abstract

Spectroscopic methods in modern astrophysics. Proceedings of the conference held 13-15 September 2006, Moscow, Russia. Eds. L. M

Astronomy and Astrophysics

Astrophysics

Scientific paper

Present paper is devoted to the discussion of main features of diffusion of chemical elements and their isotopes in the atmospheres of chemically peculiar (CP) stars, including the separation of isotopes of chemical elements in these atmospheres due to light-induced drift (LID). Diffusion is effective only in the case of quiescent stellar atmospheres, i.e. in the atmospheres where the large-scale motions (convection, meridional circulation, stellar %wind) are lacking or are extremely weak. Main equations are given and their physical meaning has been explained. Numerical computations have been carried out for the evolutionary segregation of mercury isotopes in the atmospheres of HgMn stars. Computational results of the evolutionary modelling are illustrated by the figures. The cases where the initial abundance of Hg is solar, exceeds it by 3 dex and 6 dex are studied. The initial mixture of isotopes has been taken to be corresponding to the terrestrial one. Also the case where the initial mercury abundance and isotopic mixture correspond to the observations of HR 7775 is discussed. It has been found that evolution of stellar atmospheres results in sedimentation of lighter isotopes of heavy elements and finally in the strong prevalence of the heaviest isotope, in the present case of the ^{204}Hg.

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