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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.

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