Rotation in the ionized envelope of MWC 349A

Details Rotation in the ionized envelope of MWC 349A Rotation in the ionized envelope of MWC 349A

Jun 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...428..324r&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 428, no. 1, p. 324-328

Astronomy and Astrophysics

Astronomy

22

Line Spectra, Magnetohydrodynamic Flow, Pre-Main Sequence Stars, Radio Astronomy, Recombination Reactions, Rotating Disks, Stellar Envelopes, Angular Momentum, Local Thermodynamic Equilibrium, Photoexcitation, Spatial Resolution, Stellar Models, Very Large Array (Vla)

Scientific paper

Using the Very Large Array (VLA) in the A configuration we mapped the H92 alpha recombination line and the adjacent continuum emission at 3.6 cm from the peculiar emission-line star MWC 349A. The recombination line emission is consistent with local thermodynamic equilibrium conditions. Our data resolves spatially for the first time the kinematic structure of this envelope. The observed motions can be explained in terms of a bipolar outflow undergoing significant rotation. The inclination angle of the outflow axis with respect to the plane of the sky is estimated to be about 15 deg. Angular momentum conservation arguments indicate that this rotating gas cannot have originated from the stellar surface and most probably is photoevaporating from a disk around the star. Assuming Keplerian rotation, we estimate the mass of the star to be approximately 30 solar masses. The presence of a rotating disk in association with MWC 349A favors a pre-main-sequence nature for this object.

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