Friday, October 17 - AM |
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8:15 |
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Continental Breakfast ACES Connector Lobby |
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9:00-12:15 |
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Session 1: Formation and Evolution of Stars ACES 2.302 David Lambert Session Chair |
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9:00 |
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Welcome ACES 2.302 Mary Ann Rankin Dean, College of Natural Sciences Don Winget Chairman, Department of Astronomy Frank Bash Frank N. Edmonds Regents Professor and Outgoing Director of McDonald Observatory |
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9:15 |
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Toward a New Paradigm of Star Formation:
Does Nature Abhor a Singular Isothermal Sphere? ACES 2.302 Brenda Matthews The quest to understand the process of star formation has expanded greatly over the past decade. At this summer's IAU symposium, more speakers discussed what conditions precluded and regulated star formation than presented measurements of radial profiles or mass accretion rates. This represents a shift in the language and scale of the problem of star formation. The field has evolved to ask questions on much broader scales than even five years ago. Observations reveal that the elegant simple picture of the singular isothermal sphere collapse model is not seen in real molecular clouds. Increasing numbers of observations show that the conditions for collapse are not easy to define, and identification of the origin of the initial mass function of stars and the source of multiple star systems remain unclear. I will discuss the current state of multi-scale studies of star-forming clouds and cores, including turbulence and magnetic fields, and the difference between starless and pre-stellar cores. I will then attempt to identify what are the most critical missing pieces to the star formation puzzle and how the next generation of telescopes and instrumentation could provide the answers. |
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10:00 |
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The Quest for the Most Metal-Poor Stars:
From Ongoing to Future Surveys ACES 2.302 Norbert Christlieb Extremely metal-poor stars are an important tool for studying, among other things, the formation and chemical evolution of the Galaxy, the properties of the first generation of massive stars exploding as type II supernovae, and nucleosynthesis processes occurring in them. I will review the current status of the search for the most metal-poor stars and give an overview of what are in my opinion the most important problems of the field. I will conclude with an outlook on what might possibly be achieved with future surveys, the next generation of large telescopes, dedicated and specialized small telescopes, and future space missions. |
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10:45-11:05 |
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Coffee |
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11:05 |
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The Vigorous Afterlife of Stars:
From Gamma-Ray Bursts to Accreting Black Holes and Neutron Stars ACES 2.302 Kristen Menou From gamma-ray burst afterglows to radiatively-inefficient accreting black holes and anomalously-powered X-ray pulsars, several new manifestations of the afterlife of massive stars have emerged over the past few years. I will review recent observational breakthroughs in stellar high-energy astrophysics and highlight key theoretical issues that remain to be addressed. The combination of differential rotation and magnetic fields is, arguably, one of the most important physical ingredients, common to all these manifestations. |
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11:50-12:15 |
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Panel Discussion UT Panel Members: Carlos Allende-Prieto Seth Redfield Chris Gerardy |
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12:15-1:15 |
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Lunch ACES Connector Lobby |
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