3-d Dynamical Evolution Of The High-mass Young Stellar ObjectSource I In Orion Bn/kl On Scales 10-100 Au As Traced By Sio Masers

Details 3-d Dynamical Evolution Of The High-mass Young Stellar ObjectSource I In Orion Bn/kl On Scales 10-100 Au As Traced By Sio Masers 3-d Dynamical Evolution Of The High-mass Young Stellar ObjectSource I In Orion Bn/kl On Scales 10-100 Au As Traced By Sio Masers

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21334703g&link_type=abstract

American Astronomical Society, AAS Meeting #213, #347.03; Bulletin of the American Astronomical Society, Vol. 41, p.483

Astronomy and Astrophysics

Astronomy

Scientific paper

A detailed picture of high-mass star formation has remained elusive, largely owing to difficulties in probing the circumstellar gas around high-mass young stellar objects (YSOs) at scales 10-100 AU, where outflows are expected to be launched and collimated by accretion disks. Radio Source I in Orion BN/KL is the nearest example of a high-mass YSO, and only one of three YSOs known to power both SiO and H2O masers. Using VLA and VLBA observations of both maser species, the KaLYPSO project (http://www.cfa.harvard.edu/kalypso/) aims to overcome past observational limitations by mapping the structure, 3-D velocity field, and dynamical evolution of the circumstellar gas 10-1000 AU from Source I. Based on 20 epochs of VLBA observations over 2 years, I will present a movie of bulk gas flow tracing the compact disk and bipolar flow from Source I, discuss its relationship to the large-scale outflows in the BN/KL region, and comment on implications for the structure of the global star forming region. Assuming that Source I represents a common stage of high-mass YSO evolution, interpretation of the 3-D dynamical evolution of Source I will provide unique constraints on models of high-mass star formation.
The KaLYPSO project is supported by the National Science Foundation under Grant No. NSF AST 0507478.

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