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We present new Spitzer Space Telescope observations of the region NGC 2467,and use these observations to determine how the environment of an HII regionaffects the process of star formation. Our observations comprise IRAC (3.6,4.5, 5.8, and 8.0 um) and MIPS (24 um) maps of the region, coveringapproximately 400 square arcminutes. The images show a region of ionized gaspushing out into the surrounding molecular cloud, powered by an O6V star andtwo clusters of massive stars in the region. We have identified as candidateYoung Stellar Objects (YSOs) 45 sources in NGC 2467 with infrared excesses inat least two mid-infrared colors. We have constructed color-color diagrams ofthese sources and have quantified their spatial distribution within the region.We find that the YSOs are not randomly distributed in NGC 2467; rather, over75% of the sources are distributed at the edge of the HII region, alongionization fronts driven by the nearby massive stars. The high fraction of YSOsin NGC 2467 that are found in proximity to gas that has been compressed byionization fronts supports the hypothesis that a significant fraction of thestar formation in NGC 2467 is triggered by the massive stars and the expansionof the HII region. At the current rate of star formation, we estimate at least25-50% of the total population of YSOs formed by this process.

Spitzer Observations of the HII Region NGC 2467: An Analysis of Triggered Star Formation