Explaining the UV-optical Excess
Turolla, Zane & Drake in preparation
Can we explain the optical excess with a thin, ionized gasoues
layer
on the top of the Fe solid?
H deposited by very slow accretion (or fallback). 10
9
g of H in 10
5
yr
Þ
deposition rate 10
-4
g/s. Orders of magnitude below Bondi.
H is likely not to condensate.
With a typical scale height of 1 cm:
Is
»
200 times larger than