Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983msngr..32...20g&link_type=abstract
The Messenger, No. 32:JUN, P.20, 1983
Astronomy and Astrophysics
Astronomy
2
Scientific paper
When astronomers want to determine the properties of an object in the universe, they need a reliable distance to that object. Consequently there always has been much effort to find methods for distance determination. In the case of planetary nebulae, distances are very difficult to determine. Several methods have been tried but individual distances in general are still uncertain by a factor of two to three, sometimes even more. We have used an in principle powerful method, the "extinction method" to derive accurate distances for about 10 planetary nebulae.
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