CO J = 3-2 and J = 2-1 observations of NGC 7027

Details CO J = 3-2 and J = 2-1 observations of NGC 7027 CO J = 3-2 and J = 2-1 observations of NGC 7027

Oct 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...380..461j&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 380, Oct. 20, 1991, p. 461-475.

Astronomy and Astrophysics

Astrophysics

47

Carbon Monoxide, Emission Spectra, Molecular Gases, Planetary Nebulae, Abundance, Astronomical Models, Interstellar Gas, Mass Transfer, Radiative Transfer

Scientific paper

The molecular envelope surrounding the planetary nebula NGC 7027 in the J = 3-2 line of (C-12)O is mapped and the central position in the J = 3-2 line of (C-13)O and the J = 2-1 lines of (C-12)O and (C-13)O is observed. The mass-loss rate along the nebula's polar axis is found to be about half that in the equatorial directions. Bright line wings are caused by a bipolar flow of molecular gas along the low-density axis. Bright line wings are caused by a bipolar flow of molecular gas along the low-density axis. It is argued that the marked asymmetry in the J = 3-2 line profile toward the central position is due to a radiative transfer effect. The data are compared with CO J = 1-0 observations, and new estimates are derived for envelope parameters from a detailed model. The kinetic temperature, total mass-loss rate, and CO:H2 abundance ratio are derived.

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