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Wednesday 14 Mar 2018[Seminar] Setting Stellar Chronometers: The PTF(+) Open Cluster Survey

Dr. Marcel Agueros - Columbia University

Physics 4th Floor 14:00-15:00

While we have known for 45 years of the existence of a relation between a
solar-mass star's age, rotation, and magnetic activity, observational
limitations have hampered the assembly of uniform samples of rotation and
activity measurements for stars spanning a wide range of ages and masses.
We are still far from being able to describe fully the evolution of either
rotation or activity for low-mass stars, or from being able to use
rotation or activity measurements to estimate accurately the ages of
isolated field stars. I will describe results from our efforts to assemble
a complete sample of rotation and activity measurements for low-mass stars
in six nearby open clusters ranging in age from ~100 Myr to ~3 Gyr. I will
focus on our recent results for the benchmark clusters Praesepe and the
Hyades, on new results for NGC 752, and on tests of models of rotational
evolution that these data have enabled.

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