COLLOQUIUM: Morgan MacLeod, CFO Harvard
Wann: Mi, 29.11.2023, 14:00 Uhr bis 15:30 Uhr
Breaking tidal waves on a stellar surface
The star MACHO 80.7443.1718 is the most extreme of the class of "heartbeat" stars -- which are tidally stretched and perturbed once per orbital period. This system has a 35 solar mass primary star and a 40% swing in brightness, indicating large amplitude tides each periapse passage. I will discuss modeling of this system that shows that each orbit these tides lose phase coherence and break -- like breaking waves at a beach. The wave breaking dissipates tidal energy, and feeds a hot, rotating, circumstellar atmosphere that is visible in the stellar spectra.
Online-Talk on Zoom:
Meeting ID: 660 0653 5328