Oct 01, 2020

Meridith Joyce, Australia National University (ANU)

"What we learn when we're careful: the power of Seismic Stellar Evolution"

Betelgeuse is closer than we thought, but we're safe from its end-of-life explosion for at least the next ten thousand years. In the meantime, we see the future of the Sun unfold in real time through the dying breaths of T Ursae Minoris. Nearby, Alpha Centauri A and B offer rare insight into the inner workings of stellar convection---an opportunity once afforded only by the Sun. And across the sky, young stars reveal their ages via their oscillation spectra. These are just a few of the things we have learned in the last 2 years thanks to Gaia, TESS, and seismic stellar evolution: a modeling technique that exploits multi-timescale simulations of the evolution and structure of stars. In this talk, I will discuss the novel ways in which I combine precision stellar evolution calculations with seismic perturbations and a rigorous treatment of observational and theoretical uncertainties to build predictive timelines of variable stars, revise best estimates for the fundamental parameters of our most important calibrators, and conquer highly degenerate modeling problems to derive a more precise radius for Betelgeuse than can be obtained from interferometry.

 

Zoom Link: 
https://us02web.zoom.us/j/88513896776?pwd=Y1JtRE1KZllxWkFTamJBSGtGdm9yQT09

 

      Meeting ID: 885 1389 6776

 

      Passcode: 713070

Event Details

Date:
Oct 01, 2020

Time:
4–5:45pm

Location:
Online Zoom meeting

Notes:
:Tea at 3:45 PM and Talk is at 4:00 PM. See abstract for Zoom information

Speaker Host:
Professor Richard Townsend, Astronomy Chair

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