The optical gravitational lensing experiment. Discovery of the first candidate microlensing event in the direction of the Galactic Bulge

Astronomy and Astrophysics – Astronomy

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Brown Dwarf Stars, Galactic Bulge, Gravitational Lenses, Galactic Halos, Photometry

Scientific paper

We report the discovery of the first candidate microlensing event to be discovered in the direction of the Galactic Bulge. The peak brightness of the candidate event occurred on 15 June 1993. The event had time scale (R0/V, R0-the Einstein radius, V -the transverse velocity of the lens) equal to 23.8 plus or minus 0.9 day and amplification A = 2.4 plus or minus 0.1. The lensed star is at the turn-off point in the Galactic Bulge. The lensing object is likely to be a disk M-dwarf of about 0.3 solar mass.

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