2FGL J1311.7-3429 Joins the Black Widow Club

  title={2FGL J1311.7-3429 Joins the Black Widow Club},
  author={Roger W. Romani},
  journal={The Astrophysical Journal},
  • R. Romani
  • Published 6 July 2012
  • Physics
  • The Astrophysical Journal
We have found an optical/X-ray counterpart candidate for the bright, but presently unidentified, Fermi source 2FGL J1311.7-3429. This counterpart undergoes large-amplitude quasi-sinusoidal optical modulation with a 1.56 hr (5626 s) period. The modulated flux is blue at peak, with T{sub eff} Almost-Equal-To 14, 000 K, and redder at minimum. Superimposed on this variation are dramatic optical flares. Archival X-ray data suggest modest binary modulation, but no eclipse. With the {gamma}-ray… 

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