dc.contributor.author Yan, M. dc.contributor.author Federman, S. R. dc.contributor.author Dalgarno, A. dc.contributor.author Bjorkman, J. E. dc.date.accessioned 2019-09-24T17:25:03Z dc.date.issued 1999 dc.identifier.citation Yan, M., S. R. Federman, A. Dalgarno, and J. E. Bjorkman. 1999. “Theoretical Modeling ofISOResults on Planetary Nebula NGC 7027.” The Astrophysical Journal 515 (2): 640–48. https://doi.org/10.1086/307047. dc.identifier.issn 0004-637X dc.identifier.issn 1538-4357 dc.identifier.uri http://nrs.harvard.edu/urn-3:HUL.InstRepos:41397397 * dc.description.abstract 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 0.5 x 10(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. dc.language.iso en_US dc.publisher American Astronomical Society dash.license LAA dc.title Theoretical Modeling of ISO Results on Planetary Nebula NGC 7027 dc.type Journal Article dc.description.version Version of Record dc.relation.journal The Astrophysical Journal dash.depositing.author Dalgarno, Alexander::501fae4cfad8b04754ee2838c45fc5d0::600 dc.date.available 2019-09-24T17:25:03Z dash.workflow.comments 1Science Serial ID 95667 dc.identifier.doi 10.1086/307047 dash.source.volume 515;2 dash.source.page 640-648
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