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Title:
The binary system MWC 349
Authors:
Cohen, M.; Bieging, J. H.; Dreher, J. W.; Welch, W. J.
Affiliation:
AA(NASA, Ames Research Center, Moffett Field; California, University, Berkeley, CA, USA), AB(California, University, Berkeley, CA, USA), AC(Department of Physics, Massachusetts Institute of Technology, USA), AD(Radio Astronomy Laboratory, University of California, Berkeley, CA, USA)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 292, May 1, 1985, p. 249-256. (ApJ Homepage)
Publication Date:
05/1985
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
BINARY STARS, EARLY STARS, EMISSION SPECTRA, OPTICAL EMISSION SPECTROSCOPY, RADIO ASTRONOMY, H II REGIONS, HOT STARS, INFRARED SPECTROSCOPY, INTERSTELLAR EXTINCTION, PHOTOSPHERE, STELLAR LUMINOSITY
DOI:
10.1086/163154
Bibliographic Code:
1985ApJ...292..249C

Abstract

Using the VLA the authors have resolved the ionized zone surrounding MWC 349. They see definite evidence for an interaction between a wind from MWC 349B and that from MWC 349A, in the form of an arc of enhanced radio emission. This interaction shows that the two stars form a binary system. From the 5 GHz data a wind temperature of 8700±300K and a mass loss rate of (1.2±0.05)×10-5M_sun;yr-1 are derived for MWC 349A. The authors present an optical spectrum of the B component of this binary system that enables a direct spectral classification of MWC 349B as a B0 III star, at a distance of 1.2 kpc. The unusual geometry of the radio emission, the low infrared luminosity, and this extra extinction could all be explained by an edge-on, circumstellar, dusty disk close to the orbital plane of the binary.

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