EDP Sciences
Free access
Volume 423, Number 2, August IV 2004
Page(s) 705 - 715
Section Stellar atmospheres
DOI http://dx.doi.org/10.1051/0004-6361:20041012

A&A 423, 705-715 (2004)
DOI: 10.1051/0004-6361:20041012

The spectroscopic signature of roAp stars

T. Ryabchikova1, 2, N. Nesvacil1, 3, W. W. Weiss1, O. Kochukhov1, 4 and Ch. Stütz1

1  Department of Astronomy, University of Vienna, Türkenschanzstrasse 17, 1180 Vienna, Austria
    e-mail: first_name@astro.univie.ac.at
2  Institute of Astronomy, Russian Academy of Sciences, Pyatnitskaya 48, 109017 Moscow, Russia
    e-mail: ryabchik@inasan.rssi.ru
3  European Southern Observatory, Casilla 19001, Santiago 19, Chile
4  Uppsala Astronomical Observatory, Box 515, 751 20 Uppsala, Sweden

(Received 2 April 2004 / Accepted 10 May 2004)

To reliably determine the spectroscopic signature of rapidly oscillating chemically peculiar (roAp) stars it is also necessary to investigate a sample of non pulsating chemically peculiar (noAp) as well as presumably "normal" stars. We describe in this study the sample of spectroscopically investigated stars and comment on the techniques used for the analysis. In particular we discuss ionization disequilibria of rare earths in roAp stars that distinguish them from noAp stars. In the light of the recently discovered pulsation of $\beta$ CrB we see arguments that all magnetic CP2 stars up to a transition temperature of about 8100 K may be pulsating.

Key words: stars: abundances -- stars: atmospheres -- stars: chemically peculiar -- stars: oscillations

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