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Light‐induced drift for Hg isotopes in chemically peculiar stars
Author(s) -
Aret A.,
Sapar A.
Publication year - 2002
Publication title -
astronomische nachrichten
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.394
H-Index - 63
eISSN - 1521-3994
pISSN - 0004-6337
DOI - 10.1002/1521-3994(200203)323:1<21::aid-asna21>3.0.co;2-4
Subject(s) - stars , isotope , physics , astrophysics , natural abundance , abundance (ecology) , radiative transfer , diffusion , mercury (programming language) , thermodynamics , nuclear physics , quantum mechanics , fishery , computer science , biology , programming language
In the present paper the abundance anomalies of mercury and its isotopes in the atmospheres of HgMn stars have been studied. Observations have shown strongly anomalous isotopic composition of Hg, Pt, Tl and He in the atmospheres of such CP stars. Generation of elemental abundance anomalies in quiescent atmospheres of CP stars can generally be explained by the mechanism of diffusive segregation of elements due to oppositely directed gravitational and radiative forces. It has been shown that the formation of the observed isotopic anomalies can be successfully explained by a diffusion mechanism called the light‐induced drift (LID). The observed ratios of isotopes also enable to estimate the evolutionary stages of CP stars.