Roger W. Romani, Michael S. Shaw
We have measured dramatic flux and spectral variations through the 0.193d
orbit of the optical counterpart of the unidentified gamma-ray source 0FGL
J2339.8-0530. This compact object companion is strongly heated, with T_eff
varying from ~6900K (superior conjunction) to <3000K at minimum. A combined fit
to the light curve and radial velocity amplitudes implies M_1 ~ 0.075M_sun, M_2
~ 1.4 M_sun and inclination i ~ 57deg. Thus this is a likely `black widow'
system with Edot~10^{34-34.5} erg/s pulsar driving companion mass loss. This
wind, also suggested by the X-ray light curve, may prevent radio pulse
detection. Our measurements constrain the pulsar's reflex motion, increasing
the possibility of a pulse detection in the gamma-ray signal.
View original:
http://arxiv.org/abs/1111.3074
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