Astronomy and Astrophysics – Astronomy
Scientific paper
Apr 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...515..640y&link_type=abstract
The Astrophysical Journal, Volume 515, Issue 2, pp. 640-648.
Astronomy and Astrophysics
Astronomy
17
Infrared: Ism: Lines And Bands, Ism: Molecules, Molecular Processes, Planetary Nebulae: Individual (Ngc 7027)
Scientific paper
We present a thermal and chemical model of the neutral envelope of planetary nebula NGC 7027. In our model, the neutral envelope is composed of a thin dense shell of constant density and an outer stellar wind region with the usual inverse-square law density profile. The thermal and chemical structure is calculated with the assumption that the incident radiation field on the inner surface equals 0.5x10^5 times Draine's fit to the average interstellar far-ultraviolet field. The rate coefficient for H_2 formation on grains is assumed to be 1/5 the usual value to take into account the lower dust-gas mass ratio in the neutral envelope of NGC 7027. The calculated temperature in the dense shell decreases from 3000 to under 200 K. Once the temperature drops to 200 K, we assume that it remains at 200 K until the outer edge of the dense shell is reached, so that the observed intensities of CO J=16-15, 15-14, and 14-13 lines can be reproduced. The 200 K temperature can be interpreted as the average temperature of the shocked gas just behind the forward shock front in the framework of the interacting stellar wind theory. We calculate the intensities of the molecular far-infrared rotational lines by using a revised version of the escape probability formalism. The theoretical intensities for rotational lines of CO (from J=29-28 to J=14-13), CH^+, OH, and CH are shown to be in good agreement with ISO observations. The H_2 rovibrational line intensities are also calculated and are in agreement with available observations.
Bjorkman Jon E.
Dalgarno Alexander
Federman Steven Robert
Yan Maodu
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