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Possible Si II Autoionization Lines in the Spectra of Ap Stars

Published online by Cambridge University Press:  25 September 2017

C. Jamar  and
F. Praderie
C. Jamar
Affiliation:
Laboratoire d'Astrophysique Theoretique du College de France, Boulevard Arago, 75014 Paris, France
F. Praderie
Affiliation:
Laboratoire d'Astrophysique Theoretique du College de France, Boulevard Arago, 75014 Paris, France

Extract

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An extensive study of ultraviolet spectra of Ap stars observed with the S2/68 TD-1 experiment has shown a large depression at 1400 Å in the spectra of Si and SrCrEu stars which is not present in the spectra of normal stars. This feature is attributed to Si II autoionization lines. More such lines seem to appear at longer wavelength in the UV and in the visible. We discuss the interest of an astro-physical plasma to detect and study autoionization lines in absorption.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 43: Vth Conference on UV & X-Ray Spectroscopy of Astrophysical & Laboratory Plasmas , July 1977 , pp. 33
Copyright
Copyright © Crown Research Institutes 1977