Polarization during binary microlensing

Details Polarization during binary microlensing Polarization during binary microlensing

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996mnras.279..571a&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 279, Issue 2, pp. 571-580.

Astronomy and Astrophysics

Astronomy

9

Polarization, Stars: Atmospheres, Stars: Early-Type, Gravitational Lensing

Scientific paper

We calculate the time-dependent polarization of a star being gravitationally lensed by a binary system, assuming the star has an electron scattering atmosphere. Polarizations as high as ~=1 per cent can be achieved if the star crosses a caustic or passes near a cusp; otherwise, the maximum polarization is ~=0.1 per cent. During caustic crossing, polarization is larger for smaller stellar radii relative to the Einstein radius, while polarization is larger for larger radii when not crossing a caustic. Measuring polarization can be useful for testing stellar atmosphere theory; distinguishing between microlensing variability and other forms of variability; measuring the Einstein radius of the lens; and measuring the position angle of the lens and velocity direction on the sky. To achieve these ends, one needs to measure the polarization during an alert event for a hot star.

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