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Detection of High-Degree Nonradial Pulsations in Gamma Bootis

E. J. Kennelly, S. Yang, G. A. H. Walker and I. Hubeny
Publications of the Astronomical Society of the Pacific
Vol. 104, No. 671 (1992 January), pp. 15-22
Stable URL: http://www.jstor.org/stable/40679819
Page Count: 8
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Detection of High-Degree Nonradial Pulsations in Gamma Bootis
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Abstract

The line-profile variations of the rapidly rotating δ Scuti star γ Bootis can be explained by high-degree (|m|≃10) nonradial pulsations (NRPs) with an apparent period of ∆t≃0.047 days. This same period was derived from two data sets taken three months apart wherein the amplitude increased by 30%. Such high-degree NRP cannot explain the apparent reversals previously observed by Auvergne et al. for this star in the cores of the hydrogen Balmer lines and Ca ii K line. Our radialvelocity variations can be reconciled with their 0.25 day spectroscopie period if an amplitude of ~ 1 km s⁻ⁱ is adopted, an order of magnitude less than previous measurements. We demonstrate that the presence of line-profile variations from high-degree modes probably limits the accuracy of radialvelocity measurements and may appear as bumps in the radial-velocity curve.

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