Two-frequency VLA observations of compact planetary nebulae

Details Two-frequency VLA observations of compact planetary nebulae Two-frequency VLA observations of compact planetary nebulae

May 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984mnras.208..399i&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 208, May 15, 1984, p. 399-408.

Astronomy and Astrophysics

Astronomy

37

Centimeter Waves, Planetary Nebulae, Radio Sources (Astronomy), Astronomical Catalogs, Diameters, Distance, Emission Spectra, Flux Density, Optical Thickness, Radio Telescopes, Very Large Array (Vla)

Scientific paper

Sixty-two compact planetary nebulae have been observed at wavelengths of 20.5 and 6 cm. By scaling the Very Large Array, very similar beam sizes were obtained at both wavelengths: this allows relatively accurate emission measures and angular diameters to be derived even when the nebulae are unresolved. Positions accurate to 1 arcsec are presented. It is found that compact planetaries are both younger and more distant than those which are resolved. A third of the survey objects have peak emission measures greater than 107 pc cm-6, implying that they are ionization-bounded. One object, NGC 6565, has been resolved for the first time and is shown to be bipolar.

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