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Polarization of the Recombination Line Maser in MWC349

Published online by Cambridge University Press:  24 July 2012

C. Thum ,
D. Morris  and
H. Wiesemeyer
C. Thum
Affiliation:
IRAM, Avenida Divina Pastora, 7, Núcleo Central, E 18012 Granada, Spain email: thum@iram.es
D. Morris
Affiliation:
IRAM, 300 rue de la Piscine, Domaine Universitaire de Grenoble38406 Saint Martin d'Hres, France email: morris@iram.fr
H. Wiesemeyer
Affiliation:
MPIfR, Auf dem Hügel 515300 Bonn, Germany email: wiesemeyer@mpifr.mpi-bonn.de
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Abstract

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We present observations of the circular polarization of the recombination line maser in MWC 349. Six good quality Ha30α spectra were obtained during 2010 – 2011 which show that the Zeeman features are complex, time variable, and usually different for the blue- and red-shifted maser spikes. We propose that the magnetic field, located in the corona of the circumstellar disk, has toroidal and radial components. It is plausibly generated in a disk dynamo.

Keywords

stars: individual (MWC 349)stars: magnetic fieldsstars: windsoutflows
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S287: Cosmic Masers - from OH to H0 , January 2012 , pp. 49 - 53
Copyright
Copyright © International Astronomical Union 2012

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