Astronomy and Astrophysics – Astrophysics
Scientific paper
2001-04-17
Astron.Astrophys. 379 (2001) 362-373
Astronomy and Astrophysics
Astrophysics
10 pages, 21 figures, published in Astronomy & Astrophysics (2001)
Scientific paper
10.1051/0004-6361:20011288
We present WeCAPP, a long term monitoring project searching for microlensing events towards M 31. Since 1997 the bulge of M 31 was monitored in two different wavebands with the Wendelstein 0.8 m telescope. In 1999 we extended our observations to the Calar Alto 1.23 m telescope. Observing simultaneously at these two sites we obtained a time coverage of 53 % during the observability of M 31. To check thousands of frames for variability of unresolved sources, we used the optimal image subtraction method (OIS) by Alard & Lupton (1998) This enabled us to minimize the residuals in the difference image analysis (DIA) and to detect variable sources with amplitudes at the photon noise level. Thus we can detect microlensing events with corresponding amplifications A > 10 of red clump giants with M_I = 0.
Baernbantner Otto
Barwig Heinz
Bender Ralf
Fliri Juergen
Goessl Claus A.
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