Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21725805d&link_type=abstract
American Astronomical Society, AAS Meeting #217, #258.05; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
The formation of massive stars is often associated with jets and/or strong outflows. These outflows often produce a visible cavity in the surrounding envelope. Previous work has shown that the direct irradiation of the cavity wall by UV photons from near the protostellar surface has a significant and measurable effect on the observed spectrum. In particular, significant CO+, and highly excited molecular lines (e.g. of CO and H2O) are both seen and predicted. However, while UV photons explain the observed CO+ spectrum, they appear to be insufficient alone to explain the high-J CO spectrum seen by Herschel. Shocks from the jet and outflow impinging on the cavity wall may provide sufficient extra local heating and material reprocessing to explain the high-J emission that is observed. As a result, we model the effect of shocks on the outflow cavity wall. By explicitly calculating the local physical conditions (including temperature, density, and velocity structures), we then determine the chemical structure of the envelope + cavity walls. Utilizing a radiative transfer model allows us to simulate the observed spectrum for comparison with observations. We find that shocks play a significant role in the case studied.
Bruce A.
Bruderer Simon
Doty Sandy
Doty Stephen
Kristensen Lars
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