BEGIN:VCALENDAR VERSION:2.0 CALSCALE:GREGORIAN PRODID:UW-Madison-Physics-Events BEGIN:VEVENT SEQUENCE:1 UID:UW-Physics-Event-6702 DTSTART:20211014T203000Z DTEND:20211014T220000Z DTSTAMP:20260414T192058Z LAST-MODIFIED:20211006T230807Z LOCATION:4421 Sterling Hall\, Coffee and Cookies at 3:30 pm\, Talk sta rts at 3:45 pm SUMMARY:Exploring the Interaction of Convection and Rotation in the Co re Region of Massive Stars through 3-D simulations\, Astronomy Colloqu ium\, Paul Woodward\, University of Minnesota DESCRIPTION:Over the last several years\, I have been simulating stell ar interiors with a 3-D compressible hydrodynamics code\, PPMstar. Thi s work is a collaboration between my team at the University of Minneso ta and the team of Falk Herwig\, at the University of Victoria in Cana da. This work focuses on the process of material mixing at the bounda ries of convection zones and their potential effects upon stellar evol ution. Through such mixing processes\, small concentrations of nucle ar fuels can be carried downward in convection zones into regions that are much hotter\, where they can burn very rapidly with significant e nergy release. In the last two years\, we have been looking at this p rocess in massive main sequence stars\, where entrainment of hydrogen fuel into the core convection zone can extend the star's main sequence life. In the case of these main sequence stars\, we have observation s of asteroseismology to compare with to validate our results. We obt ain mixing rates that are consistently on the high side of our expecta tions. This has led us to explore the effects of rotation of these st ars on this convective boundary mixing. I will present results of sim ulations of a massive star rotating at different rates and discuss how these simulations reveal the development of more rapidly rotating equ atorial jets near the top of the central convection zone\, with corres pondingly less rapidly rotating central regions. The behavior of inte rnal gravity waves in the stably stratified gas above the convection zone will also be discussed\, with a focus on angular momentum transpo rt.
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\nWe strongly encourage you to attend the colloquium in person. If that is impossible\, it is available over zoom at the foll owing link:
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\nhttps://us02web.zoom.us/j/88024178440?pwd=Sk5 tRXdLVWJTc0RkUXEwblRaa3RvQT09 URL:https://www.physics.wisc.edu/events/?id=6702 END:VEVENT END:VCALENDAR