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The Optical Gravitational Lensing Experiment. OGLE #7: Binary Microlens or a New Unusual Variable? | | A. Udalski
; M. Szymanski
; S. Mao
; R. Di Stefano
; J. Kaluzny
; M. Kubiak
; M. Mateo
; W. Krzeminski
; | | Date: |
26 Jul 1994 | | Journal: | Astrophys.J. 436 (1994) L103 | | Subject: | astro-ph | | Abstract: | 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. | | Source: | arXiv, astro-ph/9407084 | | Services: | Forum | Review | PDF | Favorites | |
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