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We present an 86 GHz SiO (v = 1, J = 2 ---> 1) maser search toward late-typestars located within |b|<0.5 deg and 20 deg < l < 50 deg. This search is anextension at longer longitudes of a previously published work. We selected 135stars from the MSX catalog using color and flux criteria and detected 92 (86new detections). The detection rate is 68%, the same as in our previous study.  The last few decades have seen the publication of several catalogs of pointsources detected in infrared surveys (MSX, 2MASS, DENIS, ISOGAL, WISE, GLIMPSE,AKARI, and MIPSGAL). We searched each catalog for data on the 444 targets ofour earlier survey and for the 135 in the survey reported here. We confirmthat, as anticipated, most of our targets have colors typical of oxygen-richasymptotic giant branch (AGB) stars. Only one target star may have already leftthe AGB. Ten stars have colors typical of carbon-rich stars, meaning acontamination of our sample with carbon stars <=1.7%.

astronomy and astrophysics

86 GHz SiO maser survey of late-type stars in the Inner Galaxy. IV. SiO  emission and infrared data for sources in the Scutum and Sagittarius-Carina  arms, 20 deg < l < 50 deg