Astronomy and Astrophysics – Astrophysics
Scientific paper
Aug 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...137...92p&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 137, no. 1, Aug. 1984, p. 92-100.
Astronomy and Astrophysics
Astrophysics
29
Planetary Nebulae, Stellar Evolution, Astronomical Catalogs, Gas Expansion, O Stars, Plasma Dynamics, Stellar Envelopes, Stellar Mass Ejection, Stellar Winds, White Dwarf Stars, Wolf-Rayet Stars
Scientific paper
The relation between nebular expansion velocity and radius is reassessed using the revised distance scale of Pottasch (1980) and others. Contrary to previous investigations, velocity is found to increase only gradually and nonlinearly with nebular radius for the majority of nebulae. This result is used to determine a nebular formation rate of 0.0044 + or - 0.0015/cu kpc/yr, similar to that for white dwarfs. The revised nebular expansion timescale implies central star masses of about 0.75 solar mass with an overall range of 0.6-1.0 solar mass. This suggests corresponding masses of 0.7-1.5 solar mass for the central star progenitors. A clear relationship is found between central star spectral type and mass, with O and WC stars located predominantly in the mass range below 0.7 solar mass, and WR+O stars representing the range above 0.8 solar mass. The effect of stellar wind on nebular dynamics is briefly considered.
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