Pulsations of Post-AGB Pre-White Dwarfs with Hydrogen-dominated Atmospheres*
Department of Astronomy, School of Science, The University of Tokyo, Tokyo 113-0033, Japan
* The present paper is a modified extract of a more extensive refereed paper published in . Readers should see the full paper for more details.
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Published online: 23 September 2015
It is shown by a fully non adiabatic analysis that pre-white dwarfs with hydrogen-dominated atmospheres in the range of Teff = 40 000 K - 300 000 K are pul-sationally unstable due to nuclear reactions in the hydrogen burning-shell against low-degree g-modes in the period range of about 40-200 s. It is also shown that the amount of hydrogen has a significant influence on the instability domain of such pre-white dwarfs in the Hertzsprung-Russel (H-R) diagram. Hence, the thickness of hydrogen-dominated envelopes may be well constrained by observing the presence of the g-mode oscillations.
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