NGC 7027 at millimeter wavelengths - Microturbulence in the ionized shell

Details NGC 7027 at millimeter wavelengths - Microturbulence in the ionized shell NGC 7027 at millimeter wavelengths - Microturbulence in the ionized shell

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...230..457v&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 230, no. 2, April 1990, p. 457-462.

Physics

6

Helium, Hydrogen, Ion Recombination, Millimeter Waves, Planetary Nebulae, Stellar Physics, Ionized Gases, Line Spectra, Recombination Coefficient, Recombination Reactions, Turbulence, Millimeter Lines, Planetary Nebula, Recombination Lines Of H, He, C, Microturbulence, Numerical Modelling

Scientific paper

We report the detection in the millimeter wavelength range (1.3 mm-3.0 mm) of hydrogen and helium recombination lines from the planetary nebula NGC 7027. Previous detections of such H and He lines from the NGC 7027 were made in the centimeter wavelength range (1.4 cm- 6.1 cm).
The theoretical model of Masson (1989) as fitted to the H II continuum in the centimeter wavelength range is shown to be consistent with our recombination line observations at millimeter wavelengths. We derive a large microturbulent velocity (about 17 km s-1) affecting the width of the recombination lines, in addition to the thermal broadening at 14500 K and to the shell expansion at 17.5km s-1.
A detailed search for carbon recombination lines has been made at millimeter wavelengths toward the outer, cold, molecular shell of NGC 7027. Only upper limits were obtained, after 16 h of observations.

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