The kinematical evolution of the Galactic disk
1 Leibniz-Institut fuer Astrophysik Potsdam (AIP), An der Sternwarte 16, 14482 Potsdam, Germany
2 Mount Stromlo Observatory, RSAA, The Australian National University, Canberra, Australia
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We present preliminary results from follow-up observations of a carefully selected sample of subgiant stars from RAVE and Geneva-Copenhagen surveys. We find evidence of rapid saturation of the heating mechanism in the disk, with an abrupt increase of the velocity dispersion for stars older than 9 Gyr.
© Owned by the authors, published by EDP Sciences, 2012