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Abstract: A nearby star having a near-transit of a galaxy will cause a time-dependentweak lensing of the galaxy. Because the effect is small, we refer to this asweak microlensing. This could provide a useful method to weigh low-mass starsand brown dwarfs. We examine the feasibility of measuring masses in this wayand we find that a star causes measurable weak microlensing in a galaxy even at10 Einstein radii away. Of order one magnitude I < 25 galaxy comes close enoughto one or other of the ~100 nearest stars per year.

Author: Jonathan Coles, Prasenjit Saha, Hans Martin Schmid

Source: https://arxiv.org/

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