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

Abstract

We present a compilation and study of DENIS, 2MASS, ISOGAL, MSX and IRAS 1-25 μm photometry for a sample of 441 late-type stars in the inner Galaxy, which we previously searched for 86 GHz SiO maser emission \citep{messineo02}. 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 μm feature in emission, indicating only a moderate mass-loss rate.

This is paper No. 21 in a refereed journal based on data from the ISOGAL project. Based on observations with ISO, an ESA project with instruments funded by ESA member states and with the participations of ISAS and NASA. Based on observations collected at the European Southern Observatory, La Silla Chile. Based on observations carried out with the IRAM 30-m telescope located at Pico Veleta. IRAM is supported by INSU/CNRS (France), MPG (Germany) and IGN (Spain).

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