Statistics – Computation
Scientific paper
Jun 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990mnras.244..521b&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 244, June 1, 1990, p. 521-526. Research supported by SE
Statistics
Computation
44
Gas Ionization, H Ii Regions, Planetary Nebulae, Protoplanets, Stellar Evolution, Computational Astrophysics, Stellar Winds, Taylor Instability, Wind Velocity
Scientific paper
The Ly-c photon emission rate of a planetary nebula (PN) nucleus varies considerably during the lifetime of the PN itself. The growth of this rate is accompanied by the acceleration of the fast wind. The state of ionization of a momentum-driven shell and the subsequent expansion of an H II region are calculated. During the first 2000-3000 yr, the H II region can be the dominant feature of the PN, filling up to 80 percent of its volume. The model can account for many observed features, such as a bright inner ring, low-ionization knots, and a faint surrounding halo. Velocities are smaller during the momentum-driven phase of the expansion, and the derived estimates for ages of PNe are systematically higher than in a model where the fast wind starts up instantaneously.
Breitschwerdt Dieter
Kahn F. D.
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