Radio observations of the young planetary nebula NGC 6302

Astronomy and Astrophysics – Astronomy

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Planetary Nebulae, Radio Astronomy, Astronomical Maps, Carbon Monoxide, Centimeter Waves, Continuous Spectra, H Lines, Radiant Flux Density

Scientific paper

The authors present VLA observations of the bipolar planetary nebula NGC 6302 at 2, 6 and 21 cm, in continuum emission, at 2 cm in the H76α line and at 21 cm in the H Ι line. Most of the continuum emission comes from an ionized toroid with outer angular diameter of ≡10 arcsec. The H76α recombination-line emission originates predominantly from the outer parts of the ionized volume. The authors' map of the 21-cm H Ι absorption feature first observed by Rodríguez & Moran shows that it arises from the dark lane observable in short optical exposures. The authors also derive the electron temperature of the ionized gas, set an upper limit to the magnetic field in the neutral gas, and estimate the distance to the nebula. The characteristics of NGC 6302 and its central star are those expected for a young planetary nebula.

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