Arecibo interferometer observations of compact planetary nebulae

Astronomy and Astrophysics – Astronomy

Scientific paper

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Astronomical Spectroscopy, Planetary Nebulae, Radio Astronomy, Radio Interferometers, Astronomical Observatories, Emission Spectra, Globular Clusters, Radiant Flux Density, Stellar Evolution

Scientific paper

The authors present new radio observations of compact planetary nebulae made with the Arecibo 305-m antenna and with the Arecibo two-element interferometer at the frequency of 2380 MHz. Peak and mean emission measures are derived for the detected nebulae which include the very compact objects CRL618, HM Sge, and He2-459. The physical parameters of the nebulae are briefly discussed including the planetary nebula K648 in the globular cluster M15.

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