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We present Chandra X-ray Observatory and Submillimeter Array (SMA) imaging ofHBC 515, a system consisting of multiple young stellar objects (YSOs). The fivemembers of HBC 515 represent a remarkably diverse array of YSOs, ranging fromthe low-mass Class I/II protostar HBC 515B, through Class II and transitiondisk objects (HBC 515D and C, respectively), to the "diskless", intermediate-mass, pre-main sequence binary HBC 515A. Our Chandra/ACIS imaging establishesthat all five components are X-ray sources, with HBC 515A - asubarcsecond-separation binary that is partially resolved by Chandra - beingthe dominant X-ray source. We detect an X-ray flare associated with HBC 515B.In the SMA imaging, HBC 515B is detected as a strong 1.3 mm continuum emissionsource; a second, weaker mm continuum source is coincident with the position ofthe transition disk object HBC 515C. These results strongly support theprotostellar nature of HBC 515B, and firmly establish HBC 515A as a member ofthe rare class of relatively massive, X-ray luminous "weak-lined T Tauri stars"that are binaries and have shed their disks at very early stages of pre-MSevolution. The coexistence of two such disparate objects within a single,presumably coeval multiple YSO system highlights the influence of pre- MS starmass, binarity, and X-ray luminosity in regulating the lifetimes ofcircumstellar, planet-forming disks and the timescales of star-diskinteractions.

The Multiple Young Stellar Objects of HBC 515: An X-ray and Millimeter-wave Imaging Study in (Pre-main Sequence) Diversity