1:30 pm:
Nuclear Physics Seminar in 435 Physics
Speaker: Charles McEachern, University of Minnesota
Subject: Using CASTRO to Model Hydrogen Ingestion in X-Ray Bursters
In a 2004 paper Woosley et al. brie y explored, using a low-resolu tion 1D KEPLER routine, an X-ray burst model in which violent convection causes hydrogen ingestion; that is, a rapid mixture of hot carbon and cool hydrogen. The mixture burns explosively, ballooning out the neutron star photosphere in a photospheric radius expansion (PRE) burst. We implement a streamlined nuclear reaction network in CASTRO in order to follow up on this work at high resolution and in multiple dimensions. Perhaps the most valuable application of PRE burst study is to develop constraints on the stable masses and radii that can be exhibited by neutron stars. However this work is also relevant to the study of neutron star interiors as well as the hydrogen ingestion mechanism which occurs during helium shell ashes in AGB stars.
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