Astronomy Colloquium: Lee Hartmann
Lee Hartmann from the Univerity of Michigan will be the featured speaker at an upcoming Department of Physics and Astronomy colloquium. His talk is titled, "Numerical Experiments on Star Formation: Mass Functions and Angular Momenta."
The initial mass function of stars - the number of stars N formed per interval of mass M - has long been known to be a power law, with power index of -1.3. Many explanations of this distribution have been advanced over the years, including fractal dimensions of star-forming molecular clouds and/or self-similar grouping of clouds. Hartmann will discuss simplified numerical simulations of star formation which show that gravitational accretion onto initial seed masses generates a power law mass distribution approaching power index of -1 asymptotically, irrespective of complications of cloud structure. This mechanism can also explain the mass function of young star clusters, which also has a power law distribution with the index of -1. Finally, he will describe preliminary results concerning the origin of protostellar cloud angular momenta, with implications for the properties of protoplanetary disks that result from cloud collapse.
This event is free an open to the public.
Department of Physics and Astronomy