Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-02-11
Mon.Not.Roy.Astron.Soc. 327 (2001) 868
Astronomy and Astrophysics
Astrophysics
14 pages, 9 embedded postscript figures, 2 PNG figures, replaced with revised version accepted for publication in MNRAS, full
Scientific paper
10.1046/j.1365-8711.2001.04776.x
We describe observations carried out by the MOA group of the Galactic Bulge during 2000 that were designed to detect efficiently gravitational microlensing of faint stars in which the magnification is high and/or of short duration. These events are particularly useful for studies of extra-solar planets and faint stars. Approximately 17 degrees square were monitored at a sampling rate of up to 6 times per night. The images were analysed in real-time using a difference imaging technique. Twenty microlensing candidates were detected, of which 8 were alerted to the microlensing community whilst in progress. Approximately half of the candidates had high magnifications (>~10), at least one had very high magnification (>~50), and one exhibited a clear parallax effect. The details of these events are reported here, together with details of the on-line difference imaging technique. Some nova-like events were also observed and these are described, together with one asteroid.
Abe FR.
Bond Ian A.
Dodd Robert J.
Hearnshaw John B.
Honda Makoto
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