The Optical gravitational lensing experiment. OGLE 7: Binary microlens or a new unusual variable?

@article{Udalski1994TheOG,
  title={The Optical gravitational lensing experiment. OGLE 7: Binary microlens or a new unusual variable?},
  author={Andrzej Udalski and Michał K. Szymański and Shude Mao and Rosanne Di Stefano and Janusz Kaluzny and Marcin Kubiak and Mario L. Mateo and Wojtek Krzemiński},
  journal={The Astrophysical Journal},
  year={1994},
  volume={436}
}
We present the light curve of an unusual variable object, OGLE #7, detected during the OGLE search for microlensing events. After one season of being in a low, normal state, the star brightened by more than 2~mag with a characteristic double-maximum shape, and returned to normal brightness after 60 days. We consider possible explanations of the photometric behavior of OGLE #7. The binary microlens model seems to be the most likely explanation -- it reproduces well the observed light curve and… Expand

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