On Rotational Velocities in the Circumstellar Disk of MWC 349A

Details On Rotational Velocities in the Circumstellar Disk of MWC 349A On Rotational Velocities in the Circumstellar Disk of MWC 349A

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.5004d&link_type=abstract

American Astronomical Society, AAS Meeting #211, #50.04; Bulletin of the American Astronomical Society, Vol. 39, p.812

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Scientific paper

Recent mapping of the masing H30-alpha line from the circumstellar disk of MWC 349A with the Submillimeter Array revealed apparently rotational velocity gradient in the disk which is steeper than Keplerian (Weintroub et al., ApJ 2007, in press). Weintroub et al. tentatively explained this by a spiral density wave propagating in the disk. Here we analyze other possible explanations, including the possibility of a spin-up of the inner edge of the disk by the magnetized stellar wind from the central object, and possible effects that could produce the observed interferometric map with a Keplerian velocity field in the disk (the effects of the finite optical depth in the line and continuum and the effects of orientation of the disk and outflow relative to the observer). This project was supported by the NSF/REU grant AST-0354056 and by the Nantucket Maria Mitchell Association.

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