Stars much heavier than
the Sun are extremely luminous and drive strong stellar winds, blowing
a large part of their matter into the galactic environment before they
finally explode as super- or hypernova. By this strong feedback,
massive stars regulate the star formation and the further development of
the cluster in which they were born. Massive stars generate most of the
ultraviolet radiation of galaxies -- the whole Universe was re-ionized
by the first (super)massive stars -- and power their infrared luminosities.
Massive stars are bright signposts that help to determine the age, scale,
shape, and content of the Universe. Quantitative knowledge of the action
of massive stars is prerequisite to comprehend the Universe we see.
LO's Main Research Iterests