August 11-15, 2014


Constraints to post-AGB evolution speed and to IFMR derived from planetary nebulae

Krzysztof Gesicki (Nicolaus Copernicus University, Poland)

K.Gesicki, Centre for Astronomy, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University, Poland

A.A.Zijlstra, Jodrell Bank Centre for Astrophysics, School of Physics & Astronomy, University of Manchester, UK

The high resolution imaging and spectroscopic observations of 31 compact Galactic bulge planetary nebulae are used to determine their mass-averaged expansion velocities. These data are converted into post-AGB ages using the relation calibrated with Schoenberner hydrodynamical models. Comparing these ages with the Bloecker tracks results in central star masses, which are higher than WD masses and asteroseismology masses. Convolution with the cluster IFMR results in ages from the ZAMS, which are unexpectedly young.

We find that the Bloecker post-AGB tracks need to be accelerated by a factor of three to fit the local white dwarf masses. Next we adjust the IFMR as a free parameter to map the central star ages on the full age range of Galactic bulge stellar populations. We find that this fit requires a steeper IFMR than the cluster relation. Eventually the derived masses, ages and relations compose a rather consistent picture.

Mode of presentation: oral