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Uniqueness and evolutionary status of MWC 349A

Published online by Cambridge University Press:  12 July 2011

Vladimir Strelnitski ,
Kamber Schwarz ,
John Bieging ,
Josh T. Fuchs  and
Gary Walker
Vladimir Strelnitski
Affiliation:
Maria Mitchell Observatory, USA
Kamber Schwarz
Affiliation:
Maria Mitchell Observatory, USA University of Arizona, USA
John Bieging
Affiliation:
University of Arizona, USA
Josh T. Fuchs
Affiliation:
Maria Mitchell Observatory, USA Rhodes College, USA
Gary Walker
Affiliation:
Maria Mitchell Observatory, USA
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Abstract

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MWC349A, which had remained an ordinary member of the MWC catalog for a few decades, is now known as: (1) the brightest stellar source of radio continuum; (2) the only known high-gain natural maser in hydrogen recombination lines; and (3) the only strictly proven natural high-gain laser (in IR hydrogen recombination lines). These phenomena seem to occur in the circumstellar disk seen almost edge-on. They help us understand the structure and kinematics of the disk. The evolutionary status of MWC 349A is still debated: a young HAeBe star with a pre-planetary disk or an old B[e] star or even a protoplanetary nebula? We discuss new observational data obtained at the Maria Mitchell Observatory and elsewhere which may cast light on this issue.

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 6 , Symposium S272: Active OB stars: structure, evolution, mass loss, and critical limits , July 2010 , pp. 632 - 633
Copyright
Copyright © International Astronomical Union 2011

References

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