Disks:
X-rays in outburst
€During
outburst, outer regions of disk brighten first giving optical emission
€When
region of high dissipation reaches inner parts of disk X-ray emission starts to
increase
€As
accretion rate increases, inner region becomes optically thick and able to
radiate very efficiently: temperature drops so that emission is mostly in the
Ultra-Violet
UV
X-ray
optical
Wheatley, Mauche & Mattei (2003)