We present WeCAPP, a long term monitoring project searching for microlensing events towards M31. Since 1997 the bulge of M31 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

Not Available

Not Available

We examine using numerical examples and conservative assumptions, the consequences of the fractal structure of the interstellar medium in a disk galaxy in permitting the propagation of the ionizing radiation emitted by its massive stellar population. We compare the Strömgren sphere in a homogeneous medium with its equivalent in a clumpy medium

Fitting exponential profiles to the bulges of the early-type spiral galaxies from de Jong & van der Kruit (1994) under-estimates their sizes at the 2-3 sigma significance level. Allowing for the range of structural shapes which these bulges possess - through fitting an r1/n profile - the mean effective bulge radius to disk scale-length ratio, re/h

We analyze the star formation properties of the hotspot galaxy NGC 2903 using high resolution Hubble Space Telescope and adaptive optics observations. The circumnuclear star formation in NGC 2903 shows a ringlike morphology with an approximate diameter of 625 pc. For the first time, the infrared hotspots have been resolved into individual young