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VLBI Observations of the V=1 and V=2 SiO Masers in W Hydra and VX Sagittarius

Published online by Cambridge University Press:  14 August 2015

A. P. Lane ,
P. T. P. Ho ,
C. R. Predmore ,
J. M. Moran ,
R. Genzel ,
S. S. Hansen  and
M. J. Reid
A. P. Lane
Affiliation:
University of Massachusetts
P. T. P. Ho
Affiliation:
University of Massachusetts
C. R. Predmore
Affiliation:
University of Massachusetts
J. M. Moran
Affiliation:
Harvard-Smithsonian Center for Astrophysics
R. Genzel
Affiliation:
Harvard-Smithsonian Center for Astrophysics
S. S. Hansen
Affiliation:
National Radio Astronomy Observatory
M. J. Reid
Affiliation:
National Radio Astronomy Observatory

Extract

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Our previous observations established the small angular size and high brightness temperature of emission from the v=1, J=1-0 transition of SiO from the circumstellar envelopes of the supergiant VX Sgr and the Mira variable R Cas. We performed a second VLBI experiment on the SiO masers in several late type stars on 31 Oct.-2 Nov. 1978 to compare the physical characteristics of the SiO masers in the v=1 and v=2 states. With an energy separation of 1258 cm-1 (an equivalent temperature of 1753 K) between the two vibrational states, differences in excitation and pumping of the maser states may lead to different maser properties.

Information

Type
Research Article
Information
Symposium - International Astronomical Union , Volume 87: Interstellar Molecules , 1980 , pp. 535 - 536
Copyright
Copyright © Reidel 1980 

References

1. Moran, J.M., Ball, J.A., Predmore, C.R., Lane, A.P., Huguenin, G.R., Reid, M.J., Hansen, S.S.: 1979, Ap. J. (Letters) 231, pp. L67-L72.CrossRefGoogle Scholar
2. Genzel, R., Moran, J.M., Lane, A.P., Predmore, C.R., Ho, P.T.P., Hansen, S.S., Reid, M.J.: 1979, Ap. J. (Letters) 231, pp. L73-L76.CrossRefGoogle Scholar