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Atomic Data: Needs and Progress

Published online by Cambridge University Press:  12 April 2016

Marie-Christine Artru
Marie-Christine Artru*
Affiliation:
Ecole Normale Supérieure de Lyon, Laboratoire de physique, 46, Allée d’Italie, F-69364 LYON Cedex 07, FRANCE

Abstract

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We summarize the newly available results which improve both the accuracy and the completeness of atomic data to be used for analysis and modelization of A stars. A major progress is obtained from the large amount of theoretical work that has been performed through the recent revision of stellar opacities. Extensive lists of accurate line data are available and we present their general characteristics. Detailed photoionization cross-sections are now available for many initial states of different atomic ions. They currently show deep resonance structures and strongly depart from the hydrogenic shapes which were often assumed. Their importance is illustrated by the example of the Si II ultra-violet features. Further implications about computation of radiative forces are pointed out.

Type
I. General Properties of CP Stars
Information
International Astronomical Union Colloquium , Volume 138: Peculiar versus Normal Phenomena in A-Type and Related Stars , 1993 , pp. 113 - 119
Copyright
Copyright © Astronomical Society of the Pacific 1993

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