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X-rays are a powerful probe of activity in early stages of star formation.They allow us to identify young stars even after they have lost the IRsignatures of circumstellar disks and provide constraints on their distance.Here we report on XMM-Newton observations which detect 121 young stellarobjects (YSOs) in two fields between L1641S and $\kappa$ Ori. Theseobservations extend the Survey of Orion A with XMM and Spitzer (SOXS). The YSOsare contained in a ring of gas and dust apparent at millimeter wavelengths, andin far-IR and near-IR surveys. The X-ray luminosity function of the youngstellar objects detected in the two fields indicates a distance of 250-280 pc,much closer than the Orion A cloud and similar to distance estimates of$\kappa$ Ori. We propose that the ring is a 5-8 pc diameter shell that has beenswept up by $\kappa$ Ori. This ring contains several groups of stars detectedby Spitzer and WISE including one surrounding the Herbig Ae/Be stars V1818 Ori.In this interpretation, the $\kappa$ Ori ring is one of several shells swept upby massive stars within the Orion Eridanus Superbubble, and is unrelated to thesouthern portion of Orion A / L1641 S.

A star forming ring around Kappa Ori 250 pc from the Sun