A survey of compact planetary nebulae at radio wavelengths

Details A survey of compact planetary nebulae at radio wavelengths A survey of compact planetary nebulae at radio wavelengths

Aug 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990phdt.........6a&link_type=abstract

Ph.D. Thesis Calgary Univ. (Alberta). Dept. of Physics and Astronomy.

Astronomy and Astrophysics

Astronomy

3

Planetary Nebulae, Radio Sources (Astronomy), Sky Surveys (Astronomy), Brightness, Morphology, Radio Astronomy, Superhigh Frequencies, Very Large Array (Vla)

Scientific paper

A radio continuum survey of 174 objects previously classified as possible or true planetary nebulae (PN) is reported. Of these sources, 114 were detected with the very large array radio telescope, and intensity contour plots, radio flux densities at 5 GHz, diameters, and accurate positions are given. The survey leads to identification of a large number of high surface brightness objects which are likely candidates for very young PN. Modelling of the 2-dimensional brightness distributions shows that most of the survey detections can be reasonably well reproduced by a thin, prolate, ellipsoidal shell seen in projection. Examinations of other distant independent characteristics reveals that all of the surface brightness quantities are strongly correlated to each other, while all other correlations are very low. Significant differences do exist between these objects and the general population in a number of distant independent parameters. In terms of these parameters, the characteristics of the survey detections seem to be typical of other high surface brightness PN. A subgroup of 20 of the brighter, poorly resolved objects was reobserved at 15 GHz. One of these objects, K3-35, has mixed characteristics of both compact H II regions and young PN.

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