VLA 8.4 GHz continuum observations of compact planetary nebulae

Details VLA 8.4 GHz continuum observations of compact planetary nebulae VLA 8.4 GHz continuum observations of compact planetary nebulae

Dec 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993pasp..105.1456k&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 105, no. 694, p. 1456-1464

Astronomy and Astrophysics

Astronomy

10

Asymptotic Giant Branch Stars, Planetary Nebulae, Radio Astronomy, Stellar Envelopes, Brightness Distribution, Morphology, Radio Sources (Astronomy), Very Large Array (Vla)

Scientific paper

We report 8.4 GHz radio continuum observations of 15 compact planetary nebulae. The high angular resolution (approximately 0.2 arcsec) images obtained allow detailed examination of the structures of these nebulae. A number of nebulae of very high surface brightness are found to have extreme bipolar structures. This suggests that such morphologies can be developed in a very short time (less than 103 yr). These bipolar nebulae are likely to have descended from Asymptotic Giant Branch (AGB) stars with high-core masses (greater than 0.6 solar mass) which already possessed highly nonspherical envelopes at the end of the AGB phase.

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