J/ApJ/820/L28ivo://CDS.VizieR/J/ApJ/820/L28doi:10.26093/cds/vizier.18209028CDSPillitteri I.Wolk S.J.Megeath S.T.2017-01-23T22:00:00Z2016-07-06T13:44:23ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.fryoung-stellar-objectsx-ray-sourcesinfrared-photometryX-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 that 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 YSOs detected in the two fields indicates a distance of 250-280pc, much closer than the Orion A cloud and similar to distance estimates of {kappa} Ori. We propose that the ring is a 5-8pc 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 OrionA/L1641S.2016ApJ...820L..28Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/820/L28CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/xmm : XMM-Newton Observation Log (XMM-Newton Science Operation Center, 2012)J/ApJ/818/59 : IN-SYNC. IV. YSOs in Orion A (Da Rio+, 2016)J/A+A/566/A45 : Orion optical-depth and column-density maps (Lombardi+, 2014)J/ApJS/207/5 : YSOs in LDN 1641 with Hectochelle spectra (Fang+, 2013)J/ApJ/768/99 : X-ray survey of YSOs in Orion A (Pillitteri+, 2013)J/AJ/144/192 : Spitzer survey of Orion A & B. I. YSO catalog (Megeath+, 2012)J/ApJ/752/59 : Low-mass population in L1641 (Hsu+, 2012)J/A+A/504/461 : YSOs in L1630N and L1641 (Fang+, 2009)J/ApJ/676/1109 : Velocities of stars in the ONC (Furesz+, 2008)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/820/L28https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/820/L28http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/820/L28https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/820/L28https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/820/L28http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/820/L28GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/820/L28/table2 (*List of X-ray sources detected in fields KN (North) and KS (South))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/820/L28/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/820/L28/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/820/L28/table2?GETtext/xml+votable180.050000true85.608333-10.1506390.0055555555555555566/21400 21402 21403https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/820/L28?format=asciiX-rayInfrareddefaultJ/ApJ/820/L28/table2*List of X-ray sources detected in fields KN (North) and KS (South)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqRunning sequence numbermeta.id;meta.mainintRAJ2000[5] Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000[9/10] Degree of Declination (J2000)pos.eq.dec;meta.mainRate[0.1/350] XMM-Newtonw 0.3-8keV count ratect/ksphot.count;em.X-rayfloate_Rate[0.05/3] Error in Ratect/ksstat.errorfloatFlux[0.1/156] Unabsorbed 0.3-8 keV band flux in units of 1e-14erg/s/cm^2^1e-17W.m**-2phot.flux;em.X-rayfloatPr[0/1]? Protostar classification (1=yes) (2)meta.codeintnullableDk[0/1]? Star with a disk (1=yes) (2)meta.codeintnullableC3[0/1]? Class III star (1=yes)meta.codeintnullable3.6mag? WISE 3.6 micron band magnitudemagphot.mag;em.IR.3-4umfloatnullable3.6-12? WISE (3.6-12) micron band color indexmagphot.color;em.IR;em.IRfloatnullableWISEADisplay data from AllWISE (II/328) within 8.5"meta.ref.urlintnullable