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We have carried out near-IR/optical observations to examine star formationtoward a bright-rimmed cometary globule (BRC37) facing the exciting star(s) ofan HII region (IC1396) containing an IRAS source, which is considered to be anintermediate-mass protostar. With slit-less spectroscopy we detected tenH_alpha emission stars around the globule, six of which are near the tip of theglobule and are aligned along the direction to the exciting stars. There isevidence that this alignment was originally towards an O9.5 star, but hasevolved to align towards a younger O6 star when that formed. Near-IR andoptical photometry suggests that four of these six stars are low-mass youngstellar objects (YSOs) with masses of ~0.4 M_sun. Their estimated ages of ~1Myr indicate that they were formed at the tip in advance of the formation ofthe IRAS source. Therefore, it is likely that sequential star formation hasbeen taking place along the direction from the exciting stars towards the IRASsource, due to the UV impact of the exciting star(s). Interestingly, one faint,H_alpha emission star, which is the closest to the exciting star(s), seems tobe a young brown dwarf that was formed by the UV impact in advance of theformation of other YSOs at the tip.

Sequential star formation in a cometary globule (BRC37) of IC1396