Temperature and emission-measure distributions for several planetary nebulae

Details Temperature and emission-measure distributions for several planetary nebulae Temperature and emission-measure distributions for several planetary nebulae

Jun 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...317..412b&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 317, June 1, 1987, p. 412-422.

Astronomy and Astrophysics

Astrophysics

37

Astronomical Maps, Emission Spectra, Planetary Nebulae, Radio Spectra, Spectral Energy Distribution, Temperature Distribution, Astronomical Spectroscopy, Interstellar Matter, Optical Thickness

Scientific paper

Observations of BD + 30 deg 3639, NGC 6572, NGC 6590, and NGC 7027 were made at 6 cm and 20 cm with the VLA. From these data, two-dimensional distributions of temperature, emission measure, and optical depth assuming a constant line-of-sight temperature were derived. The temperature and emission-measure distributions, in general, are not similar. Temperatures for the four nebulae greatly vary, from a low of about 6000 K to a high of about 14,000 K. The results of NGC 7027 are especially interesting, since the temperature distribution is similar to the optical image.

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