Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003apj...589..953g&link_type=abstract
The Astrophysical Journal, Volume 589, Issue 2, pp. 953-959.
Astronomy and Astrophysics
Astronomy
4
Stars: Circumstellar Matter, Radio Lines: Stars, Stars: Atmospheres- Stars: Emission-Line, Be, Stars: Individual: Alphanumeric: Mwc 349A, Stars: Winds, Outflows
Scientific paper
The radial velocities of radio recombination lines from 15 to 20,000 GHz facilitate a kinematic probe of the stellar wind (outflow) from MWC 349A. These data and an earlier fit to the free-free continuum emission determine the radial velocity of the stellar wind out to more than 100 AU. The derived gas flow fits a ``beta law'' with β=6 and a terminal velocity of 32 km s-1. The derived mass loss via the wind is about 4×10-6Msolar yr-1 at a radius of 50 AU from the star, comparable to the value derived earlier by Cohen et al. by modeling an image of the 5 GHz emission observed with the Very Large Array. This outflow could also be the evaporation from the circumstellar disk rather than a conventional stellar wind. The stellar recession velocity appears to be about 12 km s-1.
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