86 GHz SiO maser survey of late-type stars in the inner Galaxy - II. Infrared photometry of the SiO target stars

We present a compilation and study of DENIS, 2MASS, ISOGAL, MSX and IRAS 1-25 mum photometry for a sample of 441 late-type stars in the inner Galaxy, which we previously searched for 86 GHz SiO maser emission (Messineo et al. 2002). The comparison of the DENIS and 2MASS J and K-S magnitudes shows that most of the SiO targets are indeed variable stars. The MSX colours and the IRAS [12]-[25] colour of our SiO targets are consistent with those of Mira type stars with dust silicate feature at 9.7 mum feature in emission, indicating only a moderate mass-loss rate.