Structure and physical properties of the bipolar outflow source NGC 7023

Details Structure and physical properties of the bipolar outflow source NGC 7023 Structure and physical properties of the bipolar outflow source NGC 7023

Jul 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...163..194w&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 163, no. 1-2, July 1986, p. 194-203.

Astronomy and Astrophysics

Astrophysics

30

Interstellar Gas, Molecular Clouds, Reflection Nebulae, Star Formation, Carbon Monoxide, Emission Spectra, Hydroxyl Emission, Mass Flow, Spectrum Analysis

Scientific paper

The reflection nebula NGC 7023 has been mapped in both the C-12O and C-13O J = 1-0 transitions. The region displays features characteristic of an outflow source with outflowing lobes directed along the minor axis, i.e., direction of least resistance, of a much longer low density molecular cloud. There is little indication from the spectra of high velocity wings arising from material within the outflowing lobes, but dense CO regions are found at the ends of the flows where the interaction with the ambient cloud has resulted in compression and heating. Optical depths, excitation temperatures, and column densities are calculated from the data and a geometrical model is constructed to fit the observed and derived parameters. Momentum and energy in the flows are consistent with values from other bipolar sources and constitute 0.6 percent of the radiative energy available from the exciting source, in this case a B3 star. The emission structure evident around the star. The emission structure evident around the star is interpreted as the heated inner surface of a cavity created by the Stromgren shell as the star evolved.

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