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SUMMARY:Ultra Low-Rate Accretion onto Single White Dwarfs via Metal-Domina
 ted Disks of Dust and Gas  - Jay Farihi (UCL)
DTSTART:20181008T130000Z
DTEND:20181008T140000Z
UID:TALK110896@talks.cam.ac.uk
CONTACT:Dr William Béthune
DESCRIPTION:I will give a few highlights of an evolving field that didn't 
 exist until 2005 or so\, and one that I hope has broad interest for those 
 interested in the physics of accretion disks\, as well as planetary rings.
   We know now that white dwarf stars are often surrounded by rings or disk
 s of planetary debris\, where in all cases the stellar atmosphere is pollu
 ted by this material.  Photospheric measurements demonstrate this material
  is strinkingly Earth-like\, with evidence for disrupted bodies that are c
 hemically analogous to planetary crusts\, cores\, and even evidence for wa
 ter (but not other volatiles).  This is all very exciting\, and transiting
  events have been seen in one case\, but the truth is we know very little 
 about how these disks form\, how they evolve\, and how the material actual
 ly accretes onto the star.  I'll present observational highlights with an 
 eye towards areas where theoretical work can have a large impact.
LOCATION:MR14\,  Centre for Mathematical Sciences\, Wilberforce Road\, Cam
 bridge
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