Astronomy and Astrophysics – Astrophysics
Scientific paper
1994-07-26
Astrophys.J. 436 (1994) L103
Astronomy and Astrophysics
Astrophysics
10 pages, 1 Table, 3 Figures; requires AAS LaTeX aaspp.sty macro. Submitted to Astrophysical Journal Letters. Paper and figure
Scientific paper
10.1086/187643
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 explains the observed colors of OGLE #7. The characteristic time scale of the OGLE #7 event, $t_E$, is equal to 80 days, the longest observed to date. The binary microlens model predicts that the spectrum of the star should be composite, with roughly 50% of its light in the $I$-band coming from a non-lensed source.
Di Stefano Rosanne
Kaluzny Janusz
Krzeminski Wojciech
Kubiak Mateo M. M.
Mao Shijun
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