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SUMMARY:Convection Affects Magnetic Turbulence in White Dwarf Accretion Di
 sks - Matthew Coleman (IAS\, Princeton)
DTSTART:20180129T140000Z
DTEND:20180129T150000Z
UID:TALK96379@talks.cam.ac.uk
CONTACT:Dr William Béthune
DESCRIPTION:I examine the accretion disks which power outbursts in two typ
 es of white dwarf binary systems: dwarf novae (DNe) and AM CVns. Accretion
  disks in these systems are thermally unstable\, causing some of the obser
 ved variations. The source of "normal outbursts" in these systems ultimate
 ly originates from ionization transitions (H for DNe and He for AM CVns). 
 These ionization transitions cause significant temperature dependence in o
 pacities and equation of states\, culminating in the occurrence of convect
 ion within these accretion disks. Local stratified shearing-box simulation
 s were used to show that this convection has a significant impact on the t
 urbulence and dynamos generated by the magnetorotational instability (MRI)
 . Most notably\, convection enhances the stress to pressure ratio\, often 
 denoted by alpha. These results were then incorporated into the disk insta
 bility model to generate the first theoretical lightcurves for dwarf novae
  outbursts which incorporate MRI physics.\n
LOCATION:MR14\,  Centre for Mathematical Sciences\, Wilberforce Road\, Cam
 bridge
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