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

Abstract

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 IR signatures of circumstellar disks and provide constraints on their distance. Here we report on XMM-Newton observations which detect 121 young stellar objects (YSOs) in two fields between L1641S and $\kappa$ Ori. These observations extend the Survey of Orion A with XMM and Spitzer (SOXS). The YSOs are contained in a ring of gas and dust apparent at millimeter wavelengths, and in far-IR and near-IR surveys. The X-ray luminosity function of the young stellar 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 been swept up by $\kappa$ Ori. This ring contains several groups of stars detected by 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 up by massive stars within the Orion Eridanus Superbubble, and is unrelated to the southern portion of Orion A / L1641 S.

6 pages, 3 figures. Accepted for publication by ApJL

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Cited by in corpus (9)

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• The Important Role of Cosmic-Ray Re-Acceleration
• A new gamma-ray source unveiled by AGILE in the region of Orion
• Detection of magnetic field in the B2 star $\rho$ Oph A with ESO FORS2
• The Orion Region: Evidence of enhanced cosmic-ray density in a stellar wind forward shock interaction with a high density shell
• XMM-Newton imaging of V1818 Ori: a young stellar group on the eastern edge of the Kappa Ori ring