J/AJ/107/2120ivo://CDS.VizieR/J/AJ/107/2120doi:10.26093/cds/vizier.51072120CDSJones T.J.Mergen J.Odewahn S.Gehrz R.D.Gatley I.,Merrill K.M.Probst R.Woodward C.E.2023-04-06T16:50:07Z1997-12-09T20:17:16ZCDS support team

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

cds-question@unistra.frinfrared-photometryWe present an unbiased survey at 1.25-2.2um of a 0.025sq.deg. region surrounding the core of Orion Molecular Cloud 2 (OMC-2). Analysis of the source counts and colors indicates that the majority of the sources brighter than K=+13 are not field stars. They must be members of a young association or associations within the survey area. The K band luminosity function (corrected for field star contamination using model calculations) exhibits a drop in counts at magnitudes fainter than K=+13 (~0.15L_{sun}_). This is most easily explained by assuming that the association(s) are young. The lowest mass stars simply have not yet reached the main sequence. The distribution of colors across the region shows moderate correlation with molecular gas, but both reddened and unreddened stars are present along most lines of sight. Considerable reflection nebulosity is present in the region of the core cluster of OMC2 itself. Of particular interest are the thin streamers emanating from the star J9, which may be the remnant of a bipolar nebula produced by the star in the recent past.1994AJ....107.2120Jhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/107/2120CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/107/2120https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/107/2120http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/107/2120https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/107/2120https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/107/2120http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/107/2120GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/107/2120/table1 (Source list)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/107/2120/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/107/2120/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/107/2120/table1?GETtext/xml+votable180.050000true83.720867-5.1749990.0055555555555555566/21439 228057.952274030004205e-20 1.7798557115773645e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/107/2120?format=asciiInfrareddefaultJ/AJ/107/2120/table1Source listDE1950Declination (1950)pos.eq.dec;meta.mainJmag? J magnitude (1.20 {mu}m)magphot.mag;em.IR.Jfloatnullablee_Jmag? rms uncertainty on Jmagmagstat.error;phot.mag;em.IR.JfloatnullableHmag? H magnitude (1.62 {mu}m)magphot.mag;em.IR.Hfloatnullablee_Hmag? rms uncertainty on Hmagmagstat.error;phot.mag;em.IR.HfloatnullableKmag? K magnitude (2.20 {mu}m)magphot.mag;em.IR.Kfloatnullablee_Kmag? rms uncertainty on Kmagmagstat.error;phot.mag;em.IR.KfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDIdentitication numbermeta.id;meta.mainintRA1950Right ascension (1950)pos.eq.ra;meta.main_RA.icrsRight ascension (ICRS) (computed by VizieR, not part of the original data)pos.eq.ranullableindexed_DE.icrsDeclination (ICRS) (computed by VizieR, not part of the original data)pos.eq.decnullableindexed