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Stellar SiO masers in the Galaxy: The Bulge Asymmetries and Dynamic Evolution (BAaDE) survey

Published online by Cambridge University Press:  16 July 2018

L. O. Sjouwerman ,
Y. M. Pihlström ,
R. M. Rich ,
M. J Claussen ,
M. R. Morris  and
the BAaDE collaboration
L. O. Sjouwerman
Affiliation:
National Radio Astronomy Observatory, Socorro NM 87801 (USA) email: [email protected]
Y. M. Pihlström
Affiliation:
National Radio Astronomy Observatory, Socorro NM 87801 (USA) email: [email protected] Dept. of Physics & Astronomy, University of New Mexico, Albuquerque NM 87131 (USA)
R. M. Rich
Affiliation:
Div. of Astronomy & Astrophysics, University of California, Los Angeles CA 90095 (USA)
M. J Claussen
Affiliation:
National Radio Astronomy Observatory, Socorro NM 87801 (USA) email: [email protected]
M. R. Morris
Affiliation:
Div. of Astronomy & Astrophysics, University of California, Los Angeles CA 90095 (USA)
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Abstract

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Circumstellar SiO masers can be observed in red giant evolved stars throughout the Galaxy. Since stellar masers are not affected by non-gravitational forces, they serve as point-mass probes of the gravitational potential and form an excellent sample for studies of the Galactic structure and dynamics. Compared to optical studies, the non-obscured masers are in particular valuable when observed close to the highly obscured Galactic Bulge and Plane. Their line-of-sight velocities can easily be obtained with high accuracy, proper motions can be measured and distances can be estimated. Furthermore, when different mass and metallicity effects can be accounted for, such a large sample will highlight asymmetries and evolutionary traces in the sample. In our Bulge Asymmetries and Dynamic Evolution (BAaDE) survey we have searched 20,000 infrared selected evolved stars for 43 GHz SiO masers with the VLA in the northern Bulge and Plane and are in the process of observing another 10,000 stars for 86 GHz SiO masers with ALMA in the southern Bulge. Our instantaneous detection rate in the Bulge is close to 70%, both at 43 and 86 GHz, with occasionally up to 7 simultaneous SiO transitions observed in a single star. Here we will outline the BAaDE survey, its first results and some of the peculiar maser features we have observed. Furthermore we will discuss the prospects for obtaining proper motions and parallaxes for individual maser stars to reconstruct individual stellar orbits.

Keywords

MasersSurveysInfrared: StarsStars: Late-typeCircumstellar MatterGalaxy: Kinematics and Dynamics
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S336: Astrophysical Masers: Unlocking the Mysteries of the Universe , September 2017 , pp. 180 - 183
Copyright
Copyright © International Astronomical Union 2018 

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