COLLOQUIUM: Morgan MacLeod, CFO Harvard

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:

https://uni-hamburg.zoom.us/j/66006535328?pwd=aGkrSjJIYmZjK0VpYlpGL0ZrdHg2UT09

Meeting ID: 660 0653 5328

Passcode: 20658852