Outstanding Issues for Post-Main Sequence Evolution: |
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| Authors: | Gilles Fontaine Pierre Brassard Stéphane Charpinet |
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| Institution: | (1) Département de Physique, Université de Montréal, C.P. 6128, Succ. Centre-Ville, Montréal, Québec H3C 3J7, Canada;(2) Observatoire Midi-Pyrénées, 14 Avenue Edouard Belin, 31400 Toulouse, France |
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| Abstract: | We review the question of the empirical and theoretical instabilityregions in the HR diagram for evolved, compact stars. These include thethree families of pulsating white dwarfs (g-mode pulsators excitedthrough mechanisms associated with partial ionization and convection inthe stellar envelope), the pulsating subdwarf B stars (p-mode variablesexcited through a classic kappa mechanism associated with the radiativelevitation of iron in the stellar envelope), and the `Betsy stars',the brand new class of long-period, g-mode pulsators of the subdwarf Btype discovered recently. |
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| Keywords: | compact pulsators instability strips |
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