Expansion velocities and dynamical ages of planetary nebulae
Gezicki K.., Zijlstra A.A., 2000,
A&A, 358, 1058
Abstract
The [O III] expansion velocities are presented for planetary nebulae
in the Galactic Bulge and Halo, and in the Sagittarius Dwarf spheroidal
galaxy. The velocities are shown to increase with the distance from the
star, in agreement with hydrodynamical models. Dynamical ages are derived
from these velocities and are corrected for the effects of post-AGB
acceleration and non-uniform velocities. Masses for the central stars are
obtained from relations between dynamical ages and stellar temperatures.
The stellar core mass distribution is narrow, peaking at 0.61 solar masses.
This is higher than predicted for the Bulge by initial-final mass relations,
but consistent with the local white dwarf mass distribution.
paper (postscript, 2.0Mb)
Last update: March 7, 2001