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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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