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Close Frequency Pairs in Delta Scuti Stars1

Published online by Cambridge University Press:  12 April 2016

K.M. Bischof  and
M. Breger
K.M. Bischof
Affiliation:
Institut für Astronomie, Universität Wien, Türkenschanzstr. 17, 1180 Wien, Austria
M. Breger
Affiliation:
Institut für Astronomie, Universität Wien, Türkenschanzstr. 17, 1180 Wien, Austria

Abstract

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The power spectra of several δ Scuti stars show close peaks with similar frequencies and amplitudes. Apart from possible observational problems, this can be interpreted in terms of two separate pulsation modes with similar, close frequencies or an artifact of amplitude variability of a single pulsation mode. If sufficient data are available, it is possible to distinguish between the two hypotheses on the basis of expected systematic phase changes associated with the amplitude variations of an assumed single frequency. This phase-shift test has been applied to modes found for BI CMi. In this paper we present the evidence for one of the close frequency pairs found in this star.

Type
Part 2.4. Delta Scuti Stars
Information
International Astronomical Union Colloquium , Volume 185: Radial and Nonradial Pulsations as Probes of Stellar Physics , 2002 , pp. 326 - 327
Copyright
Copyright © Astronomical Society of the Pacific 2002

References

Breger, M., Garrido, R., Handler, G., et al. 2001, MNRAS, submittedGoogle Scholar
Loumos, G. & Deeming, T. 1978, Ap&SS, 56, 285 Google Scholar
Rodríguez, E., et al. 2000, in ASP Conf. Ser. Vol. 210: Delta Scuti and related Stars, eds. Breger, M. & Montgomery, M., (San Francisco ASP), 499 Google Scholar