Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...174..223s&link_type=abstract
Astronomy and Astrophysics, Vol.174, NO.1&2MAR(I), P. 223, 1987
Astronomy and Astrophysics
Astrophysics
55
Scientific paper
Numerical models for the evolution of the hydrodynamics and ionization of planetary nebulae were calculated by Schmidt-Voigt and Koppen (1986). The changing radiation field from evolving central star models was explicitly taken into account. These models are compared with observational data on expansion velocities, He II/Hβ line ratios, Zanstra temperatures, and electron densities. The observations are best reproduced by the following model: The central stars should evolve with time-scales as given by Schonberner's post-AGB models of 0.6 to 0.64 Msun. The nebula should be formed by an initial expulsion of about 0.1 Msun followed by accretion of matter from the ambient medium which had been blown off by the central star's progenitor on the AGB with a mass loss rate of some 10-6 to 10-5 solar masses per year.
Köppen Joachim
Schmidt-Voigt M.
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