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Two-frequency VLA observations of compact planetary nebulae (1984)

Isaacman, R.

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Publication Date: 2011-08-18

Description: 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 10 to the 7th pc cm exp -6, implying that they are ionization-bounded. One object, NGC 6565, has been resolved for the first time and is shown to be bipolar.

Keywords: ASTRONOMY

Type: Royal Astronomical Society, Monthly Notices (ISSN 0035-8711); 208; 399-408

Format: text

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