Relatively
large pulsed fraction (up to 20%)
are achieved accounting for:
ÿ Shibanov et al, 1995: radiative beaming
(atmo models and field assumed dipolar)
ÿ Page, D. 1995, Page and Sarmiento, 1996:
quadrupolar B- components (emission assumed bb-like and isotropic)
Can we account for both effects today?
Zane, Turolla, et al, 2004 in prep.
No if we just assume isotropic (bb-like) emission + a dipolar B-field.
Can pulsed fraction, skewness,
time variations be explained in term of surface
thermal emission?
Greenstein
and Hartke, 1983