The DUSTiNGS survey searched 50 nearby dwarf galaxies for dusty evolved stars using Spitzer Space Telescope 3.6 and 4.5 μm images. The targets span a large range in metal content (from about 0.2% to 8% of solar). You can see the all-sky map of the DUSTiNGS targets and their properties in Fig. 1 from Boyer et al. (2015a); the cluster of target galaxies around l=120° is the Andromeda group (we included And I to And XXII).
Paper II describes the discovery of more than 500 metal-poor dusty AGB stars. Preliminary results suggest that dust forms efficiently at least down to 0.6% solar metallicity. The catalog of dusty AGB candidates is available at CDS.
Additional follow-up programs using Spitzer and the Hubble Space Telescope are in the works.
Fig. 1 from Boyer et al. (2015a)
Team: Martha L. Boyer (PI, NASA GSFC), K. B. W. McQuinn (U. Minnesota), P. Barmby (U. Western Ontario), A. Z. Bonanos (National Obs. of Athens, Gr), R. D. Gehrz (U. Minnesota), K. D. Gordon (STScI), M. A. T. Groenewegen (Royal Obs. of Belgium), E. Lagadec (Obs. de la Côte d'Azure), D. Lennon (ESA), M. Marengo (Iowa State U.), I. McDonald (U. Manchester), M. Meixner (STScI), E. Skillman (U. Minnesota), G. C. Sloan (Cornell U.), G. Sonneborn (NASA GSFC), J. Th. van Loon (Keele U.), and A. Zijlstra (U. Manchester).