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On the Effect of Rotation on Stellar Absorption Lines

Published online by Cambridge University Press:  12 April 2016

Ilkka V. Tuominen  and
Osmi Vilhu
Ilkka V. Tuominen
Affiliation:
Astrophysics Laboratory, University of Helsinki, Helsinki, Finland
Osmi Vilhu
Affiliation:
Astrophysics Laboratory, University of Helsinki, Helsinki, Finland

Abstract

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The effect of rapid uniform rotation on equivalent widths of spectral lines is studied in the case of a star seen pole-on. Contrary to the situation for the strong lines MgII 4481 and SiII 4128, the effect may be significant for the weak ones, especially those of the EuII-type. Because the mean atmospheric parameters of a rapidly rotating star seen pole-on are very similar to those of a non-rotating star of the same mass, this may cause significant errors in abundance determinations, especially for Eu-type elements. The aspect effect on the central intensity of two EuII lines of different strengths is also studied.

Type
Part II / The Effects of Rotation on Stellar Atmospheres
Information
International Astronomical Union Colloquium , Volume 4: Stellar Rotation , 1970 , pp. 110 - 114
Copyright
Copyright © Reidel 1970

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