Physics
Scientific paper
Jan 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980aj.....85...17m&link_type=abstract
Astronomical Journal, vol. 85, Jan. 1980, p. 17-21.
Physics
15
Absorption Spectra, Astronomical Models, H Beta Line, Interstellar Extinction, Planetary Nebulae, Astronomical Catalogs, Cloud Physics, Electromagnetic Absorption, Galactic Structure, Scale Height
Scientific paper
It is found from a comparison of optical and radio emission that planetary nebulae south of the galactic plane exhibit lower average extinction at H-beta than those to the north. Suggestions are that either (1) the absorbing material is distributed with a scale height higher in the north than in the south, or (2) a large absorbing cloud immediately above the sun has increased the average extinction in the north. In either case the z-distribution of absorbing material is close to an exponential model, with extinction of 0.7 bel/kpc along the galactic plane and scale height of about 100 pc.
Aller Lawrence H.
Milne Douglas K.
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