Superheavy elements in atmospheres of magnetic stars
Study of abundances of superheavy chemical elements in magnetic stars was stimulated in the Crimean astrophysical observatory by a launching of the space station “Astron” in 1983, that allowed ultraviolet spectra of such stars to be obtained. In the present short review the abundances of very heavy elements (Pt, Au, Hg, Tl, Pb, Bi, Th and U) in atmospheres of magnetic Ap stars and HgMn stars are discussed. These results were inferred from spectra of the stars both in visual and ultraviolet regions. Data accumulated during more than 30 years show that the large overabundances of such elements, up to 6-7 dex, are typical for these stars. The following important fact is noted: anomalies of superheavy elements are a continuation of the trend in anomalies that are incident to less heavy elements. Therefore, one may suppose that all these anomalies including the large excesses of superheavy elements have the same explanation. Some unresolved problems are discussed briefly.
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