EDP Sciences
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Issue A&A
Volume 388, Number 3, June IV 2002
Page(s) 978 - 984
Section Stellar atmospheres
DOI http://dx.doi.org/10.1051/0004-6361:20020493



A&A 388, 978-984 (2002)
DOI: 10.1051/0004-6361:20020493

Do dusty A stars exhibit accretion signatures in their photospheres?

I. Kamp1, M. Hempel2 and H. Holweger3

1  Leiden Observatory, Niels Bohrweg 2, PO Box 9513, 2300 RA Leiden, The Netherlands
2  Hamburger Sternwarte, Gojenbergsweg 112, 21029 Hamburg, Germany
3  Institut für Theoretische Physik und Astrophysik, Universität Kiel, 24098 Kiel, Germany

(Received 1 February 2002 / Accepted 28 March 2002 )

Abstract
We determined abundances of O, Ca, Fe, Ba and Y for a sample of dusty and dust-free A stars, taken from the list of Cheng et al. (1992). Five of the stars have an infrared-excess due to circumstellar dust. Ongoing accretion from their circumstellar surroundings might have modified the abundances in the photospheres of these stars, but our results clearly show, that there is no difference in the photospheric composition of the dusty and dust-free stars. Instead all of them show the typical diffusion pattern which diminishes towards larger rotational velocities.


Key words: stars: atmospheres -- stars: abundances -- stars: early type -- stars: circumstellar matter

Offprint request: I. Kamp, kamp@strw.leidenuniv.nl

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Editor-in-Chief: T. Forveille
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ISSN: 0004-6361 ; e-ISSN: 1432-0746
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