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Current ongoing stellar spectroscopic surveys (RAVE, GALAH, Gaia-ESO, LAMOST,APOGEE, Gaia) are mostly devoted to studying Galactic archaeology and structureof the Galaxy. But they allow for important auxiliary science: (i) Galacticinterstellar medium can be studied in four dimensions (position in space +radial velocity) through weak but numerous diffuse insterstellar bands andatomic absorptions seen in spectra of background stars, (ii) emission spectrawhich are quite frequent even in field stars can serve as a good indicator oftheir youth, pointing e.g. to stars recently ejected from young stellarenvironments, (iii) astrometric solution of the photocenter of a binary to beobtained by Gaia can yield accurate masses when joined by spectroscopicinformation obtained serendipitously during a survey.  These points are illustrated by first results from the first three surveysmentioned above. These hint at the near future: spectroscopic studies of thedynamics of the interstellar medium can identify and quantify Galacticfountains which may sustain star formation in the disk by entraining fresh gasfrom the halo; RAVE already provided a list of ~14,000 field stars withchromosperic emission in Ca II lines, to be supplemented by many moreobservations by Gaia in the same band, and by GALAH and Gaia-ESO observationsof Balmer lines; several millions of astrometric binaries with periods up to afew years which are being observed by Gaia can yield accurate masses whensupplemented with measurements from only a few high-quality ground basedspectra.

Interstellar medium, young stars, and astrometric binaries in Galactic archaeology spectroscopic surveys