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Abundances in Rapidly Rotating a Stars

Published online by Cambridge University Press:  12 April 2016

Michael Lemke
Michael Lemke*
Affiliation:
Astronomy Department, University of Texas, Austin, TX 78712;U.S.A.

Abstract

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A study is undertaken to determine abundances in rapidly rotating main sequence A stars (v sin i = 100 − 180 km/s) in order to investigate if non-solar abundance patterns found in slow rotators (Lemke 1989, 1990) persist toward higher rotational velocities. This will provide some insight into how the Am phenomenon and other chemical peculiarities are connected with slow rotation and diffusion processes.

Most stars were found to have a rather solar composition. At least one star, HR5023, is enriched in Ba by approximately one order of magnitude relative to the sun at a v sin i of 110km/s. Both C and Ba will be discussed.

Type
IV. Related Stars
Information
International Astronomical Union Colloquium , Volume 138: Peculiar versus Normal Phenomena in A-Type and Related Stars , 1993 , pp. 407 - 412
Copyright
Copyright © Astronomical Society of the Pacific 1993

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