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SiO maser survey of evolved stars in the Galaxy: various environments of maser sources

Published online by Cambridge University Press:  01 March 2007

Shuji Deguchi
Shuji Deguchi*
Affiliation:
Nobeyama Radio Observatory, National Astronomical Observatory, Minamimaki, Minamisaku, Nagano, 384-1305, Japan email: [email protected] Graduate University for Advanced Studies, National Astronomical Observatory, Minamimaki, Minamisaku, Nagano, 384-1305, Japan
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Abstract

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Using the SiO J=1−0 v=1 and v=2 lines near 43 GHz, we have detected about 2000 of 3600 sources observed with the Nobeyama 45-m radio telescope. The sources were chosen from IRAS/MSX/2MASS catalogs using color-selection criteria to pick up mass-losing oxygen-rich AGB stars and some post-AGB objects. A number of interesting sources were also found: supergiants in a massive star cluster, a nova with light echo (V838 Mon), AGB stars in globular clusters, and AGB candidates associated with dwarf galaxies. With the exception of the stars in the massive open star cluster, these ‘unusual’ objects are associated with metal poor environments where mass losing oxygen-rich AGB stars are unexpected. It is inferred that these objects were created by stellar merging which can occur in dense star clusters.

Keywords

MasersSiOEvolved starsMergers
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S242: Astrophysical Masers and their Environments , March 2007 , pp. 200 - 207
Copyright
Copyright © International Astronomical Union 2008

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