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This Week at Physics

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Events on Tuesday, April 30th, 2019

Noon Colloquium
"An introduction to radiatively driven stellar winds "
Time: 12:00 pm
Place: 4421 Sterling Hall, Noon Talk
Speaker: Wolf-Rainer Hamann, Institute for Physics and Astronomy, University of Potsdam
Abstract: Stellar spectra that are dominated by bright and broad emission lines have been discovered by the French astronomers Wolf and Rayet 150 years ago, and must be attributed to strong outflow of matter. But only with the advent of ultraviolet spectroscopy in the 1970s it became known that stellar winds are ubiquitous among hot and luminous stars.

In principle, such winds can be driven by radiation pressure. The quantitative analysis of stellar-wind spectra requires adequate modeling of expanding stellar atmospheres. The evolution of massive stars and their final fate depends on their mass loss. This refers especially to the mass that might finally collapse into a Black Hole - i.e. such objects which are observed by gravitational waves when merging.
Host: Professor Emeritus Jay Gallagher
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Chaos & Complex Systems Seminar
Year-end celebration
Time: 12:05 pm
Place: 4274 Chamberlin (refreshments will be served)
Speaker: Various, UW Madison
Abstract: Following the tradition of recent years in which we had a delightful discussion of where we have come and where we might go with the seminars, this last seminar of the semester will be devoted to a continuation of that discussion without any formal speaker. We will also discuss what we want to do during our informal weekly lunches on the Memorial Union Terrace which begin on May 7th. This celebration will include expanded refreshments, to which your own culinary contribution is welcome.
Host: Clint Sprott
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Council Meeting
Time: 3:30 pm
Place: 2314 Chamberlin Hall
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