STAR FORMATION AND YOUNG POPULATION OF THE HII COMPLEX Sh2-294

International audienceThe Sh2-294 HII region ionized by a single B0V star features several infrared excess sources, a photodissociation region, and also a group of reddened stars at its border. The star formation scenario in this region seems to be quite complex. In this paper, we present follow-up results of Sh2-294 HII region at 3.6, 4.5, 5.8, and 8.0 mu m observed with the Spitzer Space Telescope Infrared Array Camera (IRAC), coupled with H-2 (2.12 mu m) observation, to characterize the young population of the region and to understand its star formation history. We identified 36 young stellar object (YSO, Class I, Class II, and Class I/II) candidates using IRAC color-color diagrams. It is found that Class I sources are preferentially located at the outskirts of the HII region and associated with enhanced H-2 emission; none of them are located near the central cluster. Combining the optical to mid-infrared (MIR) photometry of the YSO candidates and using the spectral energy distribution fitting models, we constrained stellar parameters and the evolutionary status of 33 YSO candidates. Most of them are interpreted by the model as low-mass (\textless 4M(circle dot)) YSOs; however, we also detected a massive YSO (similar to 9M(circle dot)) of Class I nature, embedded in a cloud of visual extinction of similar to 24 mag. Present analysis suggests that the Class I sources are indeed a younger population of the region relative to Class II sources (age similar to 4.5 x 10(6) yr). We suggest that the majority of the Class I sources, including the massive YSOs, are second-generation stars of the region whose formation is possibly induced by the expansion of the HII region powered by a similar to 4 x 10(6) yr B0 main-sequence star