Galaxy Evolution in Medias Res: Is ISM Turbulence Produced by Gravity or Feedback?
Blakesley Burkhart (Harvard CfA) - April 24, 2017 at 12:10 pm
Extensive Kepler and K2 photometry have recorded by far the most complete record of white dwarf pulsations to date. Besides enabling the precise determination of pulsation periods, they also reveal a new outburst-like phenomenon in stars near the cool edge of the instability strip. These quasiperiodic events recur on timescales of days and increase the overall stellar flux by up to 15% for many hours. The outbursts are observed to affect the pulsations in ways that can constrain theories for a physical mechanism. Since the cool edge of the instability strip is an empirically derived limit that nonadiabatic simulations have been unable to reproduce, this new behavior may represent missing physics from the theory of white dwarf pulsations.
The seminar will be held in 131A Campbell Hall.
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