Calendar

Mar
29
Thu
Colloquium (Joint with Physics): Jim Fuller (Host: Ethan Dederick)
Mar 29 @ 4:00 pm – 5:00 pm
Colloquium (Joint with Physics): Jim Fuller (Host: Ethan Dederick) @ Gardiner Hall 230

Surprising Impacts of Gravity Waves

Jim Fuller, Caltech

Gravity waves are low frequency fluid oscillations restored by buoyancy forces in planetary and stellar interiors. Despite their ubiquity, the importance of gravity waves in evolutionary processes and asteroseismology has only recently been appreciated. For instance, Kepler asteroseismic data has revealed gravity modes in thousands of red giant stars, providing unprecedented measurements of core structure and rotation. I will show how gravity modes (or lack thereof) can also reveal strong magnetic fields in the cores of red giants, and I will demonstrate that strong fields appear to be common within “retired” A stars but are absent in their lower-mass counterparts. In the late phase evolution of massive stars approaching core-collapse, vigorous convection excites gravity waves that can redistribute huge amounts of energy within the star. I will present preliminary models of this process, showing how wave energy redistribution can drive outbursts and enhanced mass loss in the final years of massive star evolution, with important consequences for the appearance of subsequent supernovae.
Sep
8
Sat
Cume #426
Sep 8 @ 9:30 am – 12:00 pm
Oct
6
Sat
Cume #427
Oct 6 @ 9:30 am – 12:00 pm
Oct
8
Mon
Pizza lunch: Patrick Gaulme
Oct 8 @ 12:30 pm – 1:30 pm
Pizza lunch: Patrick Gaulme @ AY 119

Red giants, eclipsing binaries, and asteroseismology.

Patrick Gaulme, Max Planck Institute for Solar System Research

Oct
27
Sat
Cume #428
Oct 27 @ 9:30 am – 12:00 pm
Nov
17
Sat
Cume #429
Nov 17 @ 9:30 am – 12:00 pm
Jan
19
Sat
Cume #430
Jan 19 @ 9:30 am – 12:00 pm
Feb
16
Sat
Cume #431
Feb 16 @ 9:30 am – 12:00 pm
Mar
16
Sat
Cume #432
Mar 16 @ 9:30 am – 12:00 pm
Apr
6
Sat
Cume #433
Apr 6 @ 9:30 am – 12:00 pm