Pulsating White dwarfs: The poster child and the little devil
Penn State Worthington Scranton
98% of all stars, including our Sun 5.5 billion years from now, have ended or will end their lives as white dwarfs. Some white dwarfs pulsate and give us the opportunity to study their interiors through asteroseismology. In this talk, I report on the study of two of these stars. One for which we have a very nice pulsation spectrum built on almost two years of space acquired data (by the Kepler I mission) and another also observed by Kepler, but not nearly as well behaved. The first star allows us to place tight constraints on its internal makeup and provides results that can be placed in the context of stellar evolution. The second one tests the limits of the methods traditionally used in white dwarf asteroseismology and forces us to rethink these methods.
Date: Jeudi, le 25 septembre 2014 Heure: 11:30 Lieu: Université de Montréal Pavillon Roger-Gaudry, local D-460 Contact: Pierre Bergeron