J/A+A/570/A30ivo://CDS.VizieR/J/A+A/570/A30doi:10.26093/cds/vizier.35700030CDSPettersson BArmond T. Reipurth B.2017-12-18T07:57:24Z2014-10-10T09:52:47ZCDS support team

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

cds-question@unistra.frmolecular-cloudsemission-line-starspre-main-sequence-starsphotometryWe present a deep survey of H-alpha emission-line stars in the M42 region using wide-field objective prism films. A total of 1699 H{alpha} emission-line stars were identified, of which 1025 were previously unknown, within an area of 5.5{deg}x5.5{deg} centred on the Trapezium Cluster. We present H-alpha strength estimates, positions, and JHKs photometry extracted from 2MASS, and comparisons to previous surveys. The spatial distribution of the bulk of the stars follows the molecular cloud as seen in CO and these stars are likely to belong to the very young population of stars associated with the Orion Nebula Cluster. Additionally, there is a scattered population of H-alpha emission-line stars distributed all over the region surveyed, which may consist partly of foreground stars associated with the young NGC 1980 cluster, as well as some foreground and background dMe or Be stars. The present catalogue adds a large number of candidate low-mass young stars belonging to the Orion population, selected independently of their infrared excess or X-ray emission.2014A&A...570A..30Phttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/570/A30CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/127/1117 : Halpha emission-line stars in NGC2264 (Reipurth+, 2004)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/570/A30https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/570/A30http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/570/A30https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/570/A30https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/570/A30http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/570/A30GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/570/A30/table2 (H{alpha} emission-line stars in M42)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/570/A30/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/570/A30/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/570/A30/table2?GETtext/xml+votable180.050000true81.1888333-4.06119440.0055555555555555565/5357-5359 5370 5700-5701 5703 5712 6/21406 21423 21425-21427 21474 21486 22789 22809 22852 22854 22856-228588.650015785639275e-20 1.7003137259100215e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/570/A30?format=asciiOpticaldefaultJ/A+A/570/A30/table2H{alpha} emission-line stars in M42SimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintESOHa[576/1834]? ESO H{alpha} number for newly discovered stars onlymeta.id;meta.mainintnullablem_ESOHaMultiplicity index on ESOHa (W+E, W, E)meta.code.multipcharRAJ2000Right Ascension J2000 (4)pos.eq.ra;meta.mainDEJ2000Declination J2000 (4)pos.eq.dec;meta.mainHaH{alpha} emission-line strength (5)spect.line.intensity;em.line.HalphacharmJ? USNO-B or GSC 2.2 m_J_ magnitude (6)magphot.mag;em.opt.BfloatnullablemF? USNO-B or GSC 2.2 m_F_ magnitude (6)magphot.mag;em.opt.RfloatnullablemN? USNO-B or GSC 2.2 m_N_ magnitude (6)magphot.mag;em.opt.IfloatnullableJmag? 2MASS J magnitude (4)magphot.mag;em.IR.JfloatnullableHmag? 2MASS H magnitude (4)magphot.mag;em.IR.HfloatnullableKsmag? 2MASS Ks magnitude (4)magphot.mag;em.IR.KfloatnullableNotesNotes to individual objects, in notes.dat filemeta.notecharGCVSName in General Catalog of Variable Stars (should be followed by Ori)meta.idcharKisoHaDesignation from Kiso H-{alpha} survey (1)meta.idcharHBC? Herbig and Bell catalogue (1988, Cat. V/73)meta.idintnullableHaroHaro number with extensions (2)meta.idcharPaCh? Parsamian & Chavira (1982BITon...3...69P, <PACH NNN> in Simbad)meta.idintnullableOtherOther names (3)meta.idcharJ/A+A/570/A30/notesNotesNote[1/69] Note numbermeta.note;meta.mainintprimaryTextText of the notemeta.notechar