Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979afz....15..269k&link_type=abstract
(Astrofizika, vol. 15, Apr.-June 1979, p. 269-284.) Astrophysics, vol. 15, no. 2, Oct. 1979, p. 179-187. Translation.
Astronomy and Astrophysics
Astrophysics
7
Distribution (Property), Parallax, Planetary Nebulae, Distance, Galactic Structure, Scale (Ratio), Spatial Distribution
Scientific paper
The method of determining distances to planetary nebulae proposed by Shklovskii (1956) and data on the angular expansion of 11 objects are used to construct a new scale of distances to planetary nebulae. The existing observational data have made it possible to determine the distances to 197 objects. The new scale is significantly shorter than the scales published earlier and agrees well with the statistical parallax of these objects. The investigated galactic planetary nebulae do not exhibit a concentration toward the spiral arms and are not observed at distances greater than 5 kpc from the sun. They form a very flattened subsystem and cannot be regarded as a possible component of the galactic halo population. Planetary nebulae have a concentration toward the galactic center, and studying the planetary nebulae system reveals significant effects due to observational selection.
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