The nature of the radio recombination line emission from MWC 349A

Details The nature of the radio recombination line emission from MWC 349A The nature of the radio recombination line emission from MWC 349A

Jan 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...421..314g&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 421, no. 1, p. 314-317

Physics

7

Masers, O Stars, Radio Emission, Recombination Reactions, Stellar Envelopes, Interferometers, Kinematics, Spectrum Analysis, Stellar Physics, Stellar Winds

Scientific paper

This paper reports the detection of the H39-beta radio recombination line (RRL) (205 GHz) from the star MWC 349A. Comparison of this observation with the H40-alpha (99 GHz) line shows directly that the 'horn' features of the previously detected H31-alpha (210 GHz), H30-alpha (232 GHz), and H29-alpha (256 GHz) lines are indeed strong RRL masers, thereby confirming inference made previously from time variations (Martin-Pintado et al.) and from radio interferometer observations (Planesas et al.). On the other hand, the H40-alpha, H39-beta, and the central 'pedestal' emission of the H31-29-alpha lines appear to be emitted in near-LTE conditions on the basis of their relative intensities.

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