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SUMMARY:Stellar models for 200\,000 white dwarfs observed with the Gaia sa
 tellite - Pier-Emmanuel Tremblay (Warwick)
DTSTART:20190121T140000Z
DTEND:20190121T150000Z
UID:TALK115960@talks.cam.ac.uk
CONTACT:Cleo Loi
DESCRIPTION:The vast majority of stars will become white dwarfs at the end
  of the stellar life cycle. These remnants are precise cosmic clocks owing
  to their relatively well constrained cooling rates. The Gaia Data Release
  2 has discovered 200\,000 new white dwarfs and the first direct evidence 
 of the solidification of these stars as they cool. In the next few years w
 e will follow-up these objects spectroscopically within international mult
 i-object spectroscopic surveys (WEAVE\, 4MOST). By employing spectroscopic
 ally derived atmospheric parameters combined with Gaia parallaxes\, white 
 dwarfs can constrain the local stellar formation history in a rather direc
 t way as well as the bulk chemical composition of extrasolar planets. I wi
 ll discuss the theoretical tools that we are developing to model the atmos
 phere and evolution of white dwarfs. Most notably\, I will show that 3D ra
 diation-hydrodynamics simulations now reach the level of accuracy to be th
 e preferred theoretical tool in spectroscopic and seismic analyses of whit
 e dwarfs. 
LOCATION:MR14\,  Centre for Mathematical Sciences\, Wilberforce Road\, Cam
 bridge
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