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Using Spitzer/IRAC observations of a region to be observed by the CoRoTsatellite, we have unraveled a new complex star-forming region at lowmetallicity in the outer Galaxy. We perform a study of S284 in order to outlinethe chain of events in this star-forming region. We used four-band Spitzer/IRACphotometry as well as Halpha imaging obtained with INT/WFC. Combining thesedata with the optical photometry obtained in the frame of CoRoTs preparationand the 2MASS catalog we analysed the properties and distribution of youngstellar objects (YSOs) associated with point-like sources. We also studied theSEDs of regions of extended emission, complementing our dataset with IRAS andMSX data. We find that S284 is unique in several ways: it is very isolated atthe end of a spiral arm and both the diffuse dust and ionized emission areremarkably symmetric. We have partially resolved the central clusters of thethree bubbles present in this region. Despite the different scales present inits multiple-bubble morphology, our study points to a very narrow spread ofages among the powering high-mass clusters. In contrast, the particularsawtooth structure of the extended emission at the rim of each ionized bubbleharbours either small lower-mass clusters with a younger stellar population orindividual young reddened protostars. In particular, triggered star formationis considered to be at work in these regions.

Spitzer/IRAC view of Sh 2-284: Searching for evidence of triggered star formation in an isolated region in the outer Milky Way