Observations of extended planetary nebulae. I - NGC 7293 - The Helix nebula

Details Observations of extended planetary nebulae. I - NGC 7293 - The Helix nebula Observations of extended planetary nebulae. I - NGC 7293 - The Helix nebula

Feb 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...173..145l&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 173, no. 1, Feb. 1987, p. 145-154. ZWO-supported research.

Astronomy and Astrophysics

Astronomy

21

Abundance, Astronomical Spectroscopy, Far Infrared Radiation, Planetary Nebulae, Radiant Flux Density, Infrared Astronomy Satellite, Interstellar Matter, Spaceborne Astronomy

Scientific paper

IRAS data have been used to determine the far-infrared flux density of NGC 7283. The broadband IRAS flux densities at 12 and 25 μm are mainly due to atomic line emission; only a small fraction is due to emission from a dust continuum. The 60 and 100 μm emission however is due to dust. Abundance estimates are made for some of the important ions. Due to the large angular size of the nebula it is possible to derive radial abundance profiles. These support the assertion that line emission plays an important role. A limited comparison with other nebulae has been made.

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