Towards Locating the Brightest Microlensing Events on the Sky

Details Towards Locating the Brightest Microlensing Events on the Sky Towards Locating the Brightest Microlensing Events on the Sky

1998-07-09

arxiv.org/abs/astro-ph/9807096v1

Astronomy and Astrophysics

Astrophysics

19 pages, 4 figures, accepted by ApJ

Scientific paper

10.1086/306474

It is estimated that a star brighter than visual magnitude 17 is undergoing a detectable gravitational microlensing event, somewhere on the sky, at any given time. It is assumed that both lenses and sources are normal stars drawn from a standard Bahcall-Soneira model of our Galaxy. Furthermore, over the time scale of a year, a star 15th magnitude or brighter should undergo a detectable gravitational lens amplification. Detecting and studying the microlensing event rate among the brightest 10$^8$ stars could yield a better understanding of Galactic stellar and dark matter distributions. Diligent tracking of bright microlensing events with even small telescopes might detect planets orbiting these stellar lenses.

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