Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1983
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...274..659s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 274, Nov. 15, 1983, p. 659-665.
Astronomy and Astrophysics
Astronomy
58
Hydroxyl Emission, Interstellar Masers, Nebulae, Planetary Nebulae, Radio Astronomy, Stellar Spectra, Continuous Spectra, Emission Spectra, Infrared Radiation, Ionized Gases, Molecular Clouds
Scientific paper
When fitted to a model, the presently reported VLA continuum observations at 1.465, 4.885, and 14.965 GHz of the compact nebula Vy 2-2 indicate that the thermal radio emission originates in a comparatively thin spherical shell of ionized gas having a radius of 0.2 arcsec, an electron temperature of 14,000 K, and an rms density of more than 1,000,000/cu cm. OH line emission observations of the nebula appear superposed on the edge of the shell. These observations together suggest that the ionization occurs in a thin, ionization-bounded shell at the inner edge of a molecular cloud surrounding the central star, with dust in the neutral cloud probably being the IR emission source in this object, as is consistent with the hypothesis that Vy 2-2 is a young planetary nebula with an incompletely ionized shell. Significant radio-emitting shell evolution may be detectable in a few years.
Davis Lindsey Elspeth
Seaquist Ernest R.
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