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Spectroscopy of Rapidly Oscillating Ap Stars

Published online by Cambridge University Press:  12 April 2016

W.W. Weiss ,
T.A. Ryabchikova ,
I. Savanov ,
N. Piskunov ,
V. Tsymbal ,
P. Mittermayer ,
P. Martinez ,
O. Kochukhov  and
N. Nesvacil
W.W. Weiss
Affiliation:
Institute for Astronomy, Univ. Vienna, Türkenschanzstrasse 17, A-1180 Vienna, Austria (last-name@astro.univie.ac.at)
T.A. Ryabchikova
Affiliation:
Institute for Astronomy, Univ. Vienna, Türkenschanzstrasse 17, A-1180 Vienna, Austria (last-name@astro.univie.ac.at) Institute of Astronomy, Russ. Acad. Sciences, Moscow, Russia (ryabchik@inasan.rssi.ru)
I. Savanov
Affiliation:
Crimean Astrophysical Observatory, c/o 334413 Nauchny, Crimea, Ukraine (savanov@crao.crimea.ua)
N. Piskunov
Affiliation:
Uppsala Astronomical Observatory, S-751 20 Uppsala, Sweden (last-name@astro.uu.se)
V. Tsymbal
Affiliation:
Tavrian National University, Physics Dept., 950000 Crimea, Ukraine (vad@ccssu.Crimea.ua)
P. Mittermayer
Affiliation:
Institute for Astronomy, Univ. Vienna, Türkenschanzstrasse 17, A-1180 Vienna, Austria (last-name@astro.univie.ac.at)
P. Martinez
Affiliation:
South African Astronomical Observatory, P.O. Box 9, Observatory 7935, South Africa (peter@saao.ac.za)
O. Kochukhov
Affiliation:
Uppsala Astronomical Observatory, S-751 20 Uppsala, Sweden (last-name@astro.uu.se)
N. Nesvacil
Affiliation:
Institute for Astronomy, Univ. Vienna, Türkenschanzstrasse 17, A-1180 Vienna, Austria (last-name@astro.univie.ac.at)

Abstract

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We identify Spectroscopic differences between roAp stars and Ap stars with no observational evidence for pulsation, but with otherwise similar Teff and log g values. These differences concern the abundance pattern, Hydrogen line profile anomalies, evidence for stratification, and effects of pulsation on spectral lines.

Type
Part 2.3. Chemically Peculiar Stars
Information
International Astronomical Union Colloquium , Volume 185: Radial and Nonradial Pulsations as Probes of Stellar Physics , 2002 , pp. 280 - 283
Copyright
Copyright © Astronomical Society of the Pacific 2002

References

Cowley, C.R., Ryabchikova, T., Kupka, F., Bord, D.J., Mathys, G., & Bidelman, W.R 2000, MNRAS, 317, 299 CrossRefGoogle Scholar
Cowley, C.R., Hubrig, S., Ryabchikova, T.A., Mathys, G., Piskunov, N., & Mittermayer, P. 2001, MNRAS, 302, 381 Google Scholar
Kupka, F., Ryabchikova, T.A., Weiss, W.W., Kuschnig, R., Rogl, J., & Mathys, G. 1996, A&A, 308, 886 Google Scholar
Ryabchikova, T., Savanov, I.S., Hatzes, A.R., Weiss, W.W., & Handler, G., 2000, A&A, 357, 981 Google Scholar