Kepler red-clump stars in NGC6819 and NGC6791

The precise asteroseismic measurements of gravity-mode period spacing ({Delta}{Pi}_1_) have opened the door to detailed studies of the near-core structure of such stars, which had not been possible before. Here, we provide stringent tests of various core-mixing scenarios against the largely unbiased population of red-clump stars belonging to the old-open clusters monitored by Kepler, and by coupling the updated precise inference on {Delta}{Pi}_1_ in thousands of field stars with spectroscopic constraints.

We find that models with moderate overshooting successfully reproduce the range observed of {Delta}{Pi}_1_ in clusters. In particular, we show that there is no evidence for the need to extend the size of the adiabatically stratified core, at least at the beginning of the HeCB phase. This conclusion is based primarily on ensemble studies of {Delta}{Pi}_1_ as a function of mass and metallicity.