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A Search for Heavy Elements in the Ultraviolet Spectra of Ap Stars

Published online by Cambridge University Press:  12 April 2016

A.B. Severny  and
L.S. Lyubimkov
A.B. Severny
Affiliation:
Crimean Astrophysical Observatory 334413, p/o Nauchny, Crimea, USSR
L.S. Lyubimkov
Affiliation:
Crimean Astrophysical Observatory 334413, p/o Nauchny, Crimea, USSR

Abstract

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The earlier attempts to detect the lines of heavy elements (Pb, U, Th and others) in the spectra of Ap-stars from the ground-based observations are briefly discussed. UV observations of Ap-stars with the ultraviolet telescope aboard ASTRON space station are described. The reduction of these data is considered. Three spectral regions containing the lines PbIIλ2203.53, UIIλ2556.19 and ThIIλ2368.05 were analyzed by the method of synthetic spectra. It has been shown that relatively cool Ap-star 73 Dra (Teff = 8l50 K) has a great overabundance (≥ 103ε⊙) of heavy elements U, Th, Pb and W.

Type
Section III - Magnetic CP Stars
Information
International Astronomical Union Colloquium , Volume 90: Upper Main Sequence Stars with Anomalous Abundances , 1986 , pp. 327 - 340
Copyright
Copyright © Reidel 1986

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