Patrick Dufour

Patrick Dufour http://adsabs.harvard.edu/abs/2013AAS...22130803D “polluted” white dwarfs – metal, carbon stars Stefan boltzman law 97% of stars will end up being white dwarf stars center of nebula white dwarf – dead core of a star color – usual to find age of different things of the universe 2flavors: 1) H= 0.01% M, He= 1% M (C/O) Info comes from photons Hydrogen lines are more broader than we seen at sun – pressure of white dwarf Empty space is not empty - stars traveled in milkyway - No correlation b/w the position of polluted WD (156) and the position of known interstellar clouds – need a better explanation - Remnants of material that never formed a planet… White dwarfs with debris disks Rocky planetesimals as the origin of metals in DZ stars A new evolutionary chanel? 14 white dwarfs are known, most are variable and magnetic gravity of star is high – think they’re massive (0.6Msun)

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Transcript of Patrick Dufour

Patrick Dufourhttp://adsabs.harvard.edu/abs/2013AAS...22130803D

polluted white dwarfs metal, carbon starsStefan boltzman law97% of stars will end up being white dwarf stars

center of nebula

white dwarf dead core of a star

color usual to find age of different things of the universe2flavors: 1) H= 0.01% M, He= 1% M (C/O)

Info comes from photons

Hydrogen lines are more broader than we seen at sun pressure of white dwarf

Empty space is not empty

stars traveled in milkyway No correlation b/w the position of polluted WD (156) and the position of known interstellar clouds need a better explanation Remnants of material that never formed a planet

White dwarfs with debris disks

Rocky planetesimals as the origin of metals in DZ stars

A new evolutionary chanel?

14 white dwarfs are known, most are variable and magnetic

gravity of star is high think theyre massive (0.6Msun)speed as function of its age