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A nonradial pulsation model for the rapidly rotating Delta Scuti star Kappa(2) BootisA sectorial nonradial pulsation model is used to construct theoretical line profiles which mimic the variations for Kappa(2) Boo. Synthetic spectra generated with the appropriate Teff and log g are used as input. It is found that the data can be reproduced by the combination of a high-degree l is approximately equal to 12 mode with P(osc) aproximately equal to 0.071 d, and a low-degree mode, l is approximately equal to 0-2 with P(osc) approximately equal to 0.071-0.079 d. The projected rotational velocity (v sin i - 115 +/-5 km/s) was determined by fitting synthetic line profiles to the observed spectra. The velocity amplitude of the high-degree oscillations is estimated to be about 3.5 km/s. It is found that the ratio of the horizontal and radial pulsation amplitudes is small (about 0.02) and consistent with p-mode oscillations. Comparisons are made with models invoking starspots, and it is impossible to fit the observations of Kappa(2) Boo by a starspot model without assuming unrealistic values of radius or equatorial velocity.
Document ID
19920036720
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Kennelly, E. J.
(British Columbia Univ. Vancouver British Columbia, Canada)
Walker, G. A. H.
(British Columbia, University Vancouver, Canada)
Hubeny, I.
(NASA Goddard Space Flight Center; Universities Space Research Association, Greenbelt, MD, United States)
Date Acquired
August 15, 2013
Publication Date
December 1, 1991
Publication Information
Publication: Astronomical Society of the Pacific, Publications
Volume: 103
ISSN: 0004-6280
Subject Category
Astrophysics
Accession Number
92A19344
Distribution Limits
Public
Copyright
Other

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