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“Star Formation”
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Date: |
Download-files: |
Time: |
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Thursday, 07. Sept 2017 |
Video-Recording for any system with MP4-support
- Video.mp4 (ca.456 Mb) |
15:15 – 16:25 |
Ralf Klessen
(University
Abstract :
Stars and star
clusters are the fundamental visible building blocks of galaxies at present
days as well as
in the early universe. They form by gravitational collapse in regions of
high density in
the complex multi-phase interstellar medium. The process of stellar birth
is controlled by
the intricate interplay between the self-gravity of the star-forming gas
and various
opposing agents, such as supersonic turbulence, magnetic fields, radiative
feedback, gas
pressure, and cosmic rays. Turbulence plays a dual role. On global scales
it provides
support, while at the same time it can promote local collapse.
This process is
modified by the thermodynamic response of the gas, which is determined
by the balance
between various heating and cooling processes, which in turn depend on
the chemical
composition of the material. I will review the current status of the field and
discuss a few examples
of the recent progress in present-day star formation and speculate
about the
implications for the first and second generation of stars in the universe.
The future colloquium program can be found at: