Can lensed stars be regarded as pointlike for microlensing by MACHOs?

Details Can lensed stars be regarded as pointlike for microlensing by MACHOs? Can lensed stars be regarded as pointlike for microlensing by MACHOs?

Aug 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...430..505w&link_type=abstract

The Astrophysical Journal, vol. 430, no. 2, pt. 1, p. 505-510

Astronomy and Astrophysics

Astrophysics

145

Compact Galaxies, Galactic Halos, Gravitational Lenses, Magellanic Clouds, Massive Stars, Point Sources, Stellar Mass, Astronomical Models, Cosmology, Dark Matter, Image Analysis, Light Curve, Magnification

Scientific paper

We derive an analytical formula for the maginification of an extended source with constant surface brightness lensed by a point mass. We find that the magnification for an extended source is significantly different from that for a point source when the impact parameter is comparable to the source size. In particular, the peak magnification for an extended source can be larger or smaller than the peak magnification for a point source. The results are relevant to the short-duration (approximately day) and high-magnification events in the search of massive compact halo objects in the Galactic halo by microlensing.

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