Photometric microlensing and stellar mass determination.

Details Photometric microlensing and stellar mass determination. Photometric microlensing and stellar mass determination.

Dec 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998crasb.326..939s&link_type=abstract

Comptes Rendus de l'Academie des Sciences, Sér. II, Fasc. b, Tome 326, No. 12, p. 939 - 944

Astronomy and Astrophysics

Astronomy

Gravitational Microlensing: Stellar Masses, Gravitational Microlensing: Methods Of Observation

Scientific paper

Microlensing was suggested for stellar mass determination of nearby stars by several authors. There are two aspects in gravitational microlensing: photometry and astrometry. Here only the photometric aspect, i.e. magnification of a background source by a stellar lens, will be considered. It is shown that blending of the source by the lens not only induces a degeneracy which has been pointed out by Woz´niak and Paczyński and can be removed by measuring the flux of the source outside the microlensing event, but also strongly reduces the photometric cross section as well as the duration of microlensing events. The expected number of events decreases strongly with blending. The author concludes that the event rate will be very small and that the project does not seem to be feasible, at least under current observing conditions and even in the near future.

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