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Radial Pulsation of the roAp Star HD 122970?

Published online by Cambridge University Press:  12 April 2016

G. Handler ,
E. Paunzen ,
R. Garrido ,
J. A. Guzik ,
T. E. Beach ,
R. Medupe ,
F. Chagnon ,
R. R. Shobbrook ,
J. M. Matthews  and
T. A. Ryabchikova
...Show all authors
G. Handler
Affiliation:
Institut für Astronomie, Universität Wien, Türkenschanzstraße 17, A-1180 Wien, Austria South African Astronomical Observatory, P.O. Box 9, Observatory 7935, South Africa
E. Paunzen
Affiliation:
Institut für Astronomie, Universität Wien, Türkenschanzstraße 17, A-1180 Wien, Austria
R. Garrido
Affiliation:
Instituto de Astrofisica de Andalucia, Apt. 3044, E-18080 Granada, Spain
J. A. Guzik
Affiliation:
Los Alamos National Laboratory, XTA, MS B220, Los Alamos, NM 87545-2345, USA
T. E. Beach
Affiliation:
University of New Mexico, Los Alamos, 4000 University Drive, Los Alamos, NM 87544, USA
R. Medupe
Affiliation:
Department of Astronomy, University of Cape Town, Rondebosch 7700, South Africa
F. Chagnon
Affiliation:
Department of Physics and Astronomy, University of British Columbia, Vancouver, B.C. V6T 1Z4, Canada
R. R. Shobbrook
Affiliation:
P. O. Box 518, Coonabarabran, N.S.W. 2357, Australia
J. M. Matthews
Affiliation:
Department of Physics and Astronomy, University of British Columbia, Vancouver, B.C. V6T 1Z4, Canada
T. A. Ryabchikova
Affiliation:
Institut für Astronomie, Universität Wien, Türkenschanzstraße 17, A-1180 Wien, Austria Institute of Astronomy, Pyatnitskaya Street 48, Moscow 109017, Russia
A. P. Hatzes
Affiliation:
Dept. of Astronomy and McDonald Observatory, University of Texas, Austin, TX 78712, USA

Abstract

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We acquired multisite observations of the newly discovered rapidly oscillating Ap star HD 122970. A frequency analysis shows the presence of two independent modes, one singlet and one equally spaced triplet. By applying the oblique pulsator model and asymptotic theory we infer that the triplet originates from a distorted dipole mode and that the singlet most probably corresponds to a radial mode.

Type
Part 6. Variables Close to the Main Sequence
Information
International Astronomical Union Colloquium , Volume 176: The Impact of Large-Scale Surveys on Pulsating Star Research , 2000 , pp. 490 - 491
Copyright
Copyright © Astronomical Society of the Pacific 2000

References

Arentoft, T., Handler, G., Shobbrook, R.R., et al. 2000, in these proceedings, p. 469Google Scholar
Handler, G. & Paunzen, E. 1999, A&AS, 135, 57 Google Scholar
Handler, G. et al. 2000, MNRAS, in preparationGoogle Scholar
Kurtz, D.W. 1982, MNRAS, 200, 807 CrossRefGoogle Scholar