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Pulsational velocity fields in the atmospheres of two roAp stars HR1217 and γ Equ

Published online by Cambridge University Press:  12 April 2016

M. Sachkov ,
T. Ryabchikova ,
O. Kochukhov ,
W.W. Weiss ,
P. Reegen  and
J.D. Landstreet
M. Sachkov
Affiliation:
Institute of Astronomy, Russian Academy of Science, Pyatnitskaya 48, 119017 Moscow, Russia
T. Ryabchikova
Affiliation:
Institute of Astronomy, Russian Academy of Science, Pyatnitskaya 48, 119017 Moscow, Russia Institute for Astronomy, University of Vienna, Türkenschanzstraße 17, 1180 Vienna, Austria
O. Kochukhov
Affiliation:
Uppsala Astronomical Observatory, Box 515, 751 20 Uppsala, Sweden
W.W. Weiss
Affiliation:
Institute for Astronomy, University of Vienna, Türkenschanzstraße 17, 1180 Vienna, Austria
P. Reegen
Affiliation:
Institute for Astronomy, University of Vienna, Türkenschanzstraße 17, 1180 Vienna, Austria
J.D. Landstreet
Affiliation:
Department of Astronomy, University of Western Ontario, London, Ontario N6A 3K7, Canada

Abstract

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We discuss spectroscopic observations of pulsations in the roAp stars γ Equ and HR 1217. In both stars we observe strong variations of rare-earth lines and detect running magneto-acoustic waves, but do not find evidence for a standing pulsational wave. In γ Equ we find strong pulsational variations across line profiles, characteristic of l ≥ 2 modes.

Type
Part 4. Early-type stars: B, A and F pulsators
Information
International Astronomical Union Colloquium , Volume 193: Variable Stars in the Local Group , 2004 , pp. 208 - 211
Copyright
Copyright © Astronomical Society of the Pacific 2004

References

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