Dr. Jan Forbrich, CfA

"High-energy processes in low-mass protostars - an X-ray to radio
multi-wavelength perspective"

Abstract:
Already in very early stages of star formation, high-energy processes are
occuring. These can be observed in X-rays or in nonthermal, e.g.
gyrosynchrotron, radio emission. In order to learn more about these
processes, I studied the multi-wavelength variability of very young 
protostars in the Coronet cluster, partly in coordinated simultaneous observations.
Additionally, the Coronet cluster and its X-ray properties were characterized based on
one of the deepest X-ray datasets ever obtained of a star-forming region. With
the aim of resolving peristellar magnetic structure around protostars, sensitive
VLBI observations were obtained of a few selected sources. In separate
projects, also radio variability of Young Stellar Objects was studied,
namely for a deeply embedded source in the Orion-KL star-forming region
and for the V773 Tau multiple system. Finally, I attempted to study the
role of magnetic fields in even earlier evolutionary stages of star
formation by millimeter polarimetry of molecular clouds in search of the
so-called Goldreich-Kylafis effect.