CAOSP abstracts, Volume: 38, No.: 2, year: 2008

Author(s): Sapar, A.; Aret, A.; Poolamäe, R.; Sapar, L.
Journal: Contributions of the Astronomical Observatory Skalnaté Pleso, vol. 38, no. 2, p. 273-278.
Date: 4/2008
Title: Segregation of isotopes of heavy metals due to light-induced drift: results and problems
Keyword(s): processes: diffusion, stars: atmospheres, stars: chemically peculiar
Pages: 273 -- 278

Abstract: Atutov and Shalagin (1988) proposed light-induced drift (LID) as a physically well understandable mechanism to explain the formation of isotopic anomalies observed in CP stars. We have generalized the theory of LID and applied it to diffusion of heavy elements and their isotopes in quiescent atmospheres of CP stars. Diffusional segregation of isotopes of chemical elements is described by the equations of continuity and diffusion velocity. Computations of evolutionary sequences for the abundances of mercury isotopes in several model atmospheres have been made, using the Fortran 90 program SMART composed by the authors. Results confirm predominant role of LID in separation of isotopes.