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Molecular line observations of the SiO maser source IRAS 19312+1950

Published online by Cambridge University Press:  01 February 2008

J. Nakashima ,
S. Deguchi ,
H. Imai  and
A. Kemball
J. Nakashima
Affiliation:
Department of Physics, University of Hong Kong, Pokfulam Rd., Hong Kong email: [email protected]
S. Deguchi
Affiliation:
Nobeyama Radio Observatory, National Astronomical Observatory of Japan
H. Imai
Affiliation:
Department of Physics, Kagoshima University
A. Kemball
Affiliation:
NCSA, University of Illinois at Urbana-Champaign
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Abstract

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IRAS 19312+1950 is a unique SiO maser source, exhibiting a rich set of molecular radio lines, although SiO maser sources are usually identified as oxygen-rich evolved stars, in which chemistry is relatively simple comparing with carbon-rich environments. The rich chemistry of IRAS 19312+1950 has raised a problem in circumstellar chemistry if this object is really an oxygen-rich evolved star, but its evolutional status is still controversial. In this paper, we briefly review the previous observations of IRAS 19312+1950, as well as presenting preliminary results of recent VLBI observations in maser lines. PDF file of the poster is available from http://www.geocities.jp/nakashima_junichi/

Keywords

Circumstellar matterISM: jet and outflowmasersstars: imagingstars: individual (IRAS 19312+1950)
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S251: Organic Matter in Space , February 2008 , pp. 165 - 166
Copyright
Copyright © International Astronomical Union 2008

References

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