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Title:
Time variations in millimeter-wave radio recombination lines from the Be star MWC 349A
Authors:
Gordon, M. A.
Affiliation:
AA(National Radio Astronomy Observatory, Tucson, AZ)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 387, March 10, 1992, p. 701-706. (ApJ Homepage)
Publication Date:
03/1992
Category:
Astrophysics
Origin:
STI
NASA/STI Keywords:
B STARS, MASERS, RADIO SPECTRA, STELLAR ENVELOPES, STELLAR RADIATION, STELLAR SPECTRA, EMISSION SPECTRA, LINE SPECTRA, MILLIMETER WAVES, RADIAL VELOCITY, RADIO ASTRONOMY, SPECTRAL LINE WIDTH
DOI:
10.1086/171117
Bibliographic Code:
1992ApJ...387..701G

Abstract

Observations of the 1-mm radio recombination lines (RRLs) MWC 349 from December 1989 through May 1991 are reported. A model proposed for MWC 349A by Hamann and Simon (1986, 1988) from optical emission and IR emission lines is used to advance the hypothesis that the time-varying RRLs come from the outer region of a circumstellar disk in Keplerian rotation embedded in the much larger, expanding, ionized region that encloses the entire star and disk system. The variable velocities then result from changes in radial position within the Keplerian disk. As wavelength increases from 1 mm, the masing RRLs from the inner disk weaken, and the free-free opacity of the outer region increases. The composite RRL line profiles become increasingly dominated by contributions from the expanding region enclosing the MWC 349A circumstellar disk.

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