Do dusty A stars exhibit accretion signatures in their photospheres?

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

Corresponding author: I. Kamp, kamp@strw.leidenuniv.nl

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. ([CITE]). 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.