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Highly polarized SiO v = 0 emission from late-type stars

Published online by Cambridge University Press:  03 August 2017

Hiroko Shinnaga ,
Masato Tsuboi  and
Takashi Kasuga
Hiroko Shinnaga
Affiliation:
Institute of Astronomy and Astrophysics, Academia Sinica(ASIAA), P. O. Box 23-141 Taipei, Taiwan 106, ROC Institute of Astrophysics and Planetary Science, Ibaraki University, 2-1-1 Bunkyo, Mito, 310-8512, Japan
Masato Tsuboi
Affiliation:
Institute of Astrophysics and Planetary Science, Ibaraki University, 2-1-1 Bunkyo, Mito, 310-8512, Japan
Takashi Kasuga
Affiliation:
Department of System and Control Engineeri, Hosei University, Kajino, Koganei, Tokyo, 184-8584, Japan

Abstract

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We briefly report the results of polarimetric observations of SiO emission from late-type stars taken with a millimeter polarimeter installed at the Nobeyama 45m telescope. We found that the SiO J = 2 − 1 emission in the v = 0 state from R Cas contains a highly linearly polarized component, followed by the detection of highly linearly polarized emission of the same transition from VY CMa (Shinnaga et al. 1999). The high polarization degree is a strong evidence that the v = 0 emission originates from maser action. We found out that, not only a peculiar supergiant star, but also a Mira variable star is associated with the SiO v = 0 maser.

Type
Part 2. Stellar Masers
Information
Symposium - International Astronomical Union , Volume 206: Cosmic Masers: From Protostars to Blackholes , 2002 , pp. 278 - 281
Copyright
Copyright © Astronomical Society of the Pacific 2002 

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