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						<h1 itemprop="headline">SAC Seminar - Tiara Battich: Epsilon-mechanism driven pulsations in hot pre-horizontal branch stars</h1>
						
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														Tirsdag  8. august 2017,
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														<span itemprop="name">Louise Børsen-Koch</span>
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									<p>The epsilon-mechanism is a self-excitation mechanism of pulsations which acts on the regions where nuclear burning takes place. It has been shown that epsilon-mechanisms can excite pulsations in models of hot helium-core flash, and that the pulsations of LS IV-14o116, a He-enriched hot subdwarf star, could be explained that way. We aim to study the epsilon-mechanism effects on models of hot pre-horizontal branch stars and determine, if possible, a domain of instability in the log(g) - Teff plane. We compute non-adiabatic non-radial pulsations on such stellar models, adopting different values of initial chemical abundances and mass of the hydrogen envelope at the time of the main helium flash. We find a new theoretical instability domain of long-period (400 s &lt; P &lt; 2500 s), g-modes for models with 22000 K &lt; Teff &lt; 50000 K, and 4.67 &lt; log(g) &lt; 6.15.</p>
								
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