Nonlinearity of Nonradial Modes in Evolved Stars |
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| Authors: | Rafał M Nowakowski Wojciech A Dziembowski |
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| Institution: | (1) Copernicus Astronomical Center, Bartycka 18, 00-716 Warsaw, Poland;(2) Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warsaw, Poland |
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| Abstract: | We show that in evolved stars, even at relatively low surfaceamplitudes, nonradial modes become strongly nonlinear in thehydrogen shell source, where the Brunt-Väisälä frequency hasits absolute maximum. The measure of nonlinearity is the productof horizontal displacement times the radial wavenumber,
. It becomes large already in evolved  -Scuti stars.This nonlinearity presents a major problem for interpretations ofamplitude modulation in RR Lyrae stars in terms of nonradial modeexcitation. |
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| Keywords: |  -Scuti stars" target="_blank">gif" alt="delta" align="BASELINE" BORDER="0">-Scuti stars RR Lyrae stars |
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