Bulletin of the American Physical Society
APS April Meeting 2018
Volume 63, Number 4
Saturday–Tuesday, April 14–17, 2018; Columbus, Ohio
Session C07: Tracing Chemical EvolutionInvited
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Sponsoring Units: DAP DNP Chair: Enrico Ramirez-Ruiz, University of California, Santa Cruz Room: B131-132 |
Saturday, April 14, 2018 1:30PM - 2:06PM |
C07.00001: Exploring the Universe with Metal-Poor Stars Invited Speaker: Anna Frebel One of the most important topics in modern astrophysics is understanding the formation and evolution of stars and galaxies. Recent works on the oldest, most metal-poor stars in the Galactic halo and satellite dwarf galaxies have shown that these and many topics, ranging from nuclear astrophysics to cosmology, can be studied with stellar chemical abundances ("stellar archaeology"). I will present the latest advancements in the field, including a hyper-iron poor star that indicates asymmetric first star explosions, and r-process enhanced stars in a dwarf galaxy that hold evidence to one of the first neutron star mergers after the Big Band. [Preview Abstract] |
Saturday, April 14, 2018 2:06PM - 2:42PM |
C07.00002: Understanding the Stellar Fossil Record Invited Speaker: Charli Sakari The elements in the Universe have a variety of nucleosynthetic origins---that is, they form in different stars, at different times, and in different physical conditions. The detailed chemical composition of stellar atmospheres can be determined from high resolution spectroscopy. These abundances can further be examined as a function of a star's age and location, providing insight into the formation of galaxies. In this talk I will review how spectroscopic observations of stars in the Milky Way have led to an understanding of its assembly history, and how chemical evolution models have been successful at reproducing the measured abundances. I will also discuss techniques for understanding galaxy formation and chemical evolution beyond the Milky Way, including high-resolution integrated light spectroscopy of distant globular clusters. Finally, I will highlight the importance of the elements that form via the rapid (r-) neutron capture process, and recent efforts to identify new r-process-enhanced stars in the Milky Way halo. [Preview Abstract] |
Saturday, April 14, 2018 2:42PM - 3:18PM |
C07.00003: Chemical Evolution in Simulations of Galaxy Formation Invited Speaker: Jill Naiman The talk gives an overview of recent state-of-the-art simulations aimed at probing chemical evolution in the larger context of cosmological galaxy formation. The focus of the talk is on new features of the IllustrisTNG models - a set of gravitational, hydrodynamical, MHD cosmological simulations aimed at resolving from the formation of galaxy clusters down to the structures of Milky Way dwarf galaxies. I will conclude with some preliminary results on the distribution of elements in these simulations, including alpha and r-process elements, and discuss ongoing efforts to robustly compare observational and simulated data. [Preview Abstract] |
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