Abstract
The results of an almost simultaneous observation of the 22 GHz H2O maser and the 43 GHz SiO masers in M type stars are presented. A systematic change of H2O maser spectra which shows the expansion of maser emitting region was found. Except for massive stars, the expansion velocity of the H2O maser correlates with the IRAS 12/25 micron intensity ratio that is thought to be correlated with the mass loss rate.
These results are interpreted by the collisional excitation model calculated by Cooke and Elitzur and our H2O maser's beaming model. Also the blocking effects of red shifted H2O maser emission are discussed.
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© 1993 Springer-Verlag
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Takaba, H., Miyoshi, M., Ukita, N. (1993). The evolution of water maser spectra in M type stars. In: Clegg, A.W., Nedoluha, G.E. (eds) Astrophysical Masers. Lecture Notes in Physics, vol 412. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-56343-1_291
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DOI: https://doi.org/10.1007/3-540-56343-1_291
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