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Paper: An Amplitude Limitation Mechanism for Pulsating White Dwarfs
Volume: 493, 19th European Workshop on White Dwarfs
Page: 181
Authors: Montgomery, M. H.; Romero, A. D.; Córsico, A. H.
Abstract: The mass of the convection zone in models of pulsating white dwarfs is a sensitive function of the instantaneous surface temperature; this mass can vary by up to a factor of 10 between the minimum and maximum temperature variations. Due to this sensitivity, the outer turning point for finite-amplitude g-mode pulsations varies depending upon the local surface temperature, producing a reflected wave that is slightly out of phase with that required for complete constructive interference. After many reflections, this leads to a reduction in the global amplitude of the mode. For given amplitudes, we compare the size of this damping rate with typical growth rates found in models of DAVs. This could be an important effect for stars near the red edge of the DAV instability strip.
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