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DTSTAMP:20260412T134223
DTSTART:20170316T113000
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URL:https://murmitoyen.com/events/vanille/udem/detail/752720-extremely-low-
 mass-white-dwarfs-the-story-so-far-alina-istrate-university-of-wisconsin-a
 t-milwaukee
LOCATION:Pavillon Roger-Gaudry \, 2900\, boul. Édouard-Montpetit\, Local M
 -415\, Montréal\, QC\, Canada
SUMMARY:Extremely low-mass white dwarfs: the story so far - Alina Istrate (
 University of Wisconsin at Milwaukee)
DESCRIPTION:Alina Istrate (University of Wisconsin at Milwaukee)
Résumé
E
 xtremely low-mass white dwarfs (ELM WDs) represent a new class of helium-c
 ore white dwarfs characterized by a mass smaller than ~0.25 Msun and with 
 surface gravity in the range 5 < log g < 7. Today we know of the existence
  of around 100 such objects\, with the majority of them found in binary sy
 stems with more massive CO WDs. The increasing number of discovered ELM WD
 s reveals that they can be formed in different environments\, from the Gal
 actic disk to open and globular clusters. From an evolutionary point of vi
 ew\, they are most likely the result of binary evolution as they are not e
 xpected to form from single stars within a Hubble time. The new wealth of 
 data raises questions regarding puzzling properties of these stars such as
 \, for example\, the presence of metals in the atmospheres of young bloate
 d ELM proto-WDs and the recent discovery of pulsations in three ELM proto-
 WDs. In this talk\, I will present our latest theoretical efforts regardin
 g the formation and evolution of ELM WDs.
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