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Asteroseismology and Forced Oscillations of the Simultaneous p-Mode and g-Mode Pulsator HD 209295

Published online by Cambridge University Press:  12 April 2016

G. Handler ,
L.A. Balona ,
R.R. Shobbrook ,
C. Koen ,
A. Bruch ,
E. Romero-Colmenero ,
A.A. Pamyatnykh ,
B. Willems ,
L. Eyer  and
D.J. James
...Show all authors
G. Handler
Affiliation:
South African Astronomical Observatory, P.O. Box 9, Observatory 7935, South Africa
L.A. Balona
Affiliation:
South African Astronomical Observatory, P.O. Box 9, Observatory 7935, South Africa
R.R. Shobbrook
Affiliation:
P.O. Box 518, Coonabarabran, N.S.W 2357, Australia Research School of Astronomy and Astrophysics, Australian National University, Weston Creek P.O., ACT 2611, Australia
C. Koen
Affiliation:
South African Astronomical Observatory, P.O. Box 9, Observatory 7935, South Africa
A. Bruch
Affiliation:
Labóratorio Nacional de Astrofísica, Itajubá, Brazil
E. Romero-Colmenero
Affiliation:
South African Astronomical Observatory, P.O. Box 9, Observatory 7935, South Africa
A.A. Pamyatnykh
Affiliation:
Copernicus Astronomical Center, ul. Bartycka 18, 00-716 Warsaw, Poland
B. Willems
Affiliation:
Department of Physics and Astronomy, The Open University, Walton Hall, Milton Keynes MK7 6 A A, UK
L. Eyer
Affiliation:
Instituut voor Sterrenkunde, Katholieke Universiteit Leuven, B-3001 Leuven, Belgium Astrophysical Sciences Dept., Princeton University, Princeton, New Jersey 08544, USA
D.J. James
Affiliation:
Observatoire de Genève, Chemin des Maillettes 51, CH-1290 Sauverny, Switzerland Laboratoire d’Astrophysique, Observatoire de Grenoble, Université Joseph Fourier, B.P. 53, F-38041, Grenoble Cedex 9, France School of Physics & Astronomy, University of St Andrews, North Haugh, St Andrews, FIFE, KY16 9SS, United Kingdom 475 N. Charter Street, 5534 Sterling Hall, Madison, WI 53706-1582, USA
T. Maas
Affiliation:
Instituut voor Sterrenkunde, Katholieke Universiteit Leuven, B-3001 Leuven, Belgium
L.A. Crause
Affiliation:
Department of Astronomy, University of Cape Town, Rondebosch 7700, South Africa

Abstract

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We report the discovery of both intermediate-order gravity mode and low-order pressure mode pulsation in the same star, HD 209295. It is therefore both a γ Doradus and a δ Scuti star, which makes it the first confirmed member of two classes of pulsating star.

This object is located in a close binary system with an unknown, but likely degenerate companion in an eccentric orbit, and some of the γ Doradus pulsation frequencies are exact integer multiples of the orbital frequency. We suggest that these pulsations are tidally excited. HD 209295 may be the progenitor of an intermediate-mass X-Ray binary.

Type
Part 1.2. Pulsations in Close Binaries
Information
International Astronomical Union Colloquium , Volume 185: Radial and Nonradial Pulsations as Probes of Stellar Physics , 2002 , pp. 90 - 93
Copyright
Copyright © Astronomical Society of the Pacific 2002

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