Astronomy and Astrophysics – Astrophysics
Scientific paper
Sep 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....89..336p&link_type=abstract
Astronomy and Astrophysics, vol. 89, no. 3, Sept. 1980, p. 336-341.
Astronomy and Astrophysics
Astrophysics
113
Planetary Nebulae, Stellar Mass, Electron Density (Concentration), Galactic Nuclei, Interstellar Extinction, Ionized Gases, Magellanic Clouds
Scientific paper
A new determination of the ionized mass of planetary nebulae is given. The total mass is also discussed. Aside from the mass determination, the most important conclusions are that the ionized mass usually is only a small fraction of the total mass (i.e., the nebulae are usually optically thick to ionizing radiation) and the so-called Shklovsky method of determining the distance of nebulae usually gives a substantial overestimate of the distance.
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