Abstract
Near-infrared photometry of 35 SiO maser stars ( v = 1, J = 1 - 0) of various types is presented in this paper. Combining the JHK flux densities from IRAS, the distributions of the stars on two color-color diagrams are obtained. The spectral slopes, equivalent black-body temperatures, maser luminosities and mass-loss rates of the central stars are calculated from the infrared or radio data. These parameters are then analysed together with the integrated SiO fluxes. The results show that SiO masers are common in AGB stages. The integrated SiO maser flux is only weakly correlated with the mass-loss rate, and increase slowly along the sequence from Mira stars to OH/IR stars. It is more closely correlated with the near-infrared colors and the equivalent black-body temperatures. Also, its upper limit is correlated with 12μm and 25μm fluxes. We also briefly discusses the general function and specific role of SiO maser in the evolution of AGB stars.
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