Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.3014a&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #30.14; Bulletin of the American Astronomical Society, V
Astronomy and Astrophysics
Astrophysics
Scientific paper
Outflows from young stellar objects originate very close to the forming star, and thus they must interact with the infalling envelope surrounding the protostar and disk. Since circumstellar envelopes are the main mass reservoir of low-mass protostars, outflow-induced perturbations must have a significant effect on the final mass of the nascent star. Circumstellar envelopes have sizes in the order of 1000 AU, corresponding to approximately 10" in the nearest star-forming regions. Detailed studies of the impact of outflows on the envelope and the infalling gas therefore require high spatial resolution millimeter interferometer observations. Moreover, the combination of infall and outflow motions, rotation, and turbulence, in the presence of steep density gradients on very small scales, in turn demands both high spectral resolution and observations of a number of molecular species which trace different density and kinematic regimes. I present recently obtained data from millimeter and sub-millimeter interferometer studies that show the impact outflows have on the circumstellar envelope. In particular, our results demonstrate that outflows play a major role in the envelope dispersal process and help end the infall stage. In addition, we show how outflows have an influence on the abundance of different molecules in the envelope.
This work is supported by an NSF Astronomy and Astrophysics Postdoctoral Fellowship under award AST-0401568.
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