Skip to main content
Article thumbnail
Location of Repository

THE OPTICAL GRAVITATIONAL LENSING EXPERIMENT. OGLE #7: BINARY MICROLENS OR A NEW UNUSUAL VARIABLE? ∗

By A. Udalski, M. Szymański, S. Mao, R. Di Stefano, M. Kubiak, M. Mateo and W. Krzemiński

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, tE, 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. Subject headings: dark matter – gravitational lensing – stars: low-mass, brown dwarfs, binaries ∗Based on observations obtained at the Las Campanas Observatory of the Carnegie Institution o

Year: 1994
OAI identifier: oai:CiteSeerX.psu:10.1.1.316.8555
Provided by: CiteSeerX
Download PDF:
Sorry, we are unable to provide the full text but you may find it at the following location(s):
  • http://citeseerx.ist.psu.edu/v... (external link)
  • http://arxiv.org/pdf/astro-ph/... (external link)
  • Suggested articles


    To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.