Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....76...69f&link_type=abstract
Astronomy and Astrophysics, vol. 76, no. 1, June 1979, p. 69-74.
Astronomy and Astrophysics
Astronomy
23
Astronomical Photography, Astronomical Photometry, High Resolution, Planetary Nebulae, Radio Astronomy, Astronomical Maps, Images, Radio Emission, Radio Telescopes, Tables (Data)
Scientific paper
Radio and optical structures have been compared in the following irregular planetary nebulae: NGC 6537, M1-67, NGC 7008, M1-79, M2-51, M2-55, NGC 650-1, NGC 2371-2. The main objective was to discover cases displaying a behavior similar to that of NGC 7027, where differences between optical and radio structures have been definitely revealed to a scale not much smaller than the size of the object. The radio observations have been taken with the Westerbork Synthesis Radio Telescope (WSRT) at 6 cm with a resolution of 6 arcsec, and the optical data are either from published work or original observations. No differences between radio and optical structures to the limit of a few arcsec have been found, confirming the exceptional nature, in this respect, of NGC 7027. The data have been used to discuss the physical properties and the nature of the various objects. In some cases indication is found of masses somewhat lower than the typical value of 0.2 solar mass attributed to planetary nebulae.
Felli Marcello
Perinotto Mario
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