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High- and Low-Degree Modes in Delta Scuti Stars: 1- and 2-D Fourier Analyses Of τ Peg

Published online by Cambridge University Press:  12 April 2016

Edward J. Kennelly ,
Jaymie M. Matthews  and
Gordon A.H. Walker
Edward J. Kennelly
Affiliation:
Department of Geophysics & Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1W5Canada
Jaymie M. Matthews
Affiliation:
Department of Geophysics & Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1W5Canada Departement de physique, Université de Montreal, C.P. 6128, succ. A, Montréal, Québec H3C 3J7Canada
Gordon A.H. Walker
Affiliation:
Department of Geophysics & Astronomy, University of British Columbia, Vancouver, British Columbia V6T 1W5Canada

Extract

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Stellar seismology of δ Scuti stars offers the best prospect for determining the interior properties of normal non-magnetic A-F stars on or near the main sequence. The discovery of rich eigenfrequency spectra in the light variations of several δ Scuti stars (e.g., θ2 Tau: Breger et al. 1989; GX Peg: Michel et al. 1990) should make this possible for low-degree modes (l ≤ 4). However, due to cancellation effects, modes of higher l cannot be studied through photometry or radial velocity measurements.

The detection of rapid line-profile variations among rapidly rotating δ Scuti stars (e.g., Walker et al. 1987; Kennelly et al. 1992) has extended our sensitivity to much higher modes. These variations are consistent with moderate- to high-degree modes, where |m| ~ l. (In the simplest case, they could be pure sectorial modes with |m| = l and pulsation amplitudes strongly confined to the stellar equator.) To use these data effectively, we need an objective way to identify the modes and their time evolution.

Type
VIII. Asteroseismology: observation
Information
International Astronomical Union Colloquium , Volume 137: Inside the Stars , 1993 , pp. 743 - 745
Copyright
Copyright © Astronomical Society of the Pacific 1993

References

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Michel, E., Belmonte, J.A., Alvarez, M., et al. 1990, In Confrontation Between Stellar Pulsation and Evolution, eds. Cacciari, C. and Clementini, G. (ASP Conf. Series 11), p. 332. Google Scholar
Walker, G.A.H., Yang, S. and Fahlman, G.G. 1987, Ap.J. 320, L139 Google Scholar