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X-ray emission is characteristic of young stellar objects (YSOs) and is knownto be highly variable. We investigate, via an infrared and multi-epoch X-raystudy of the L1630 dark cloud, whether and how X-ray variability in youngstellar objects is related to protostellar evolutionary state. We have analyzed11 Chandra X-ray Observatory observations, obtained over the course of fouryears and totaling ~240 ks exposure time, targeting the eruptive Class I YSOV1647 Ori in L1630. We used 2MASS and Spitzer data to identify and classify IRcounterparts to L1630 X-ray sources and identified a total of 52 X-ray emittingYSOs with IR counterparts, including 4 Class I sources and 1 Class 0/I source.We have detected cool (< 3 MK) plasma, possibly indicative of accretion shocks,in three classical T Tauri stars. A subsample of 27 X-ray-emitting YSOs werecovered by 9 of the 11 Chandra observations targeting V1647 Ori and vicinity.For these 27 YSOs, we have constructed X-ray light curves spanningapproximately four years. These light curves highlight the variable nature ofpre-main sequence X-ray emitting young stars; many of the L1630 YSOs vary byorders of magnitude in count rate between observations. We discuss possiblescenarios to explain apparent trends between various X-ray spectral properties,X-ray variance and YSO classification.

Star Formation in Orion's L1630 Cloud: an Infrared and Multi-epoch X-ray Study