University of Minnesota
School of Physics & Astronomy

Nuclear Physics Seminar

Thursday, March 12th 2009
2:30 pm:
Nuclear Physics Seminar in 435 Physics
Speaker: Yong-Zhong Qian, University of Minnesota
Subject: Chemical Evolution of the Early Universe

There is now a large database on high-resolution observations of elemental abundances in old stars that reside in the halo of our Galaxy. This represents an exquisite record of chemical evolution of the early universe and has important implications for the stellar sources producing the various elements. The observational data will be reviewed, as well as the current stellar models for nucleosynthesis. It will be shown that three different types of massive stellar sources are required to explain the data. In particular, hypernovae with large explosion energies and Fe yields are an important player.

The weekly calendar is also available via subscription to the physics-announce mailing list, and by RSS feed.