期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 743, 期 2, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/743/2/L26
关键词
gamma rays: stars; pulsars: general
资金
- NASA [NNX10AD11G, NNX11AO44G]
- NASA [NNX10AD11G, 135369, NNX11AO44G, 140125] Funding Source: Federal RePORTER
We have measured dramatic flux and spectral variations through the 0.193 day 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 similar to 6900 K (superior conjunction) to <3000 K at minimum. A combined fit to the light curve and radial velocity amplitudes imply M-1 approximate to 0.075 M-circle dot, M-2 approximate to 1.4 M-circle dot, and inclination i approximate to 57 degrees. Thus, this is a likely black widow system with a (E)over dot approximate to 10(34-34.5) erg s(-1) 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.
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