J/ApJS/208/28ivo://CDS.VizieR/J/ApJS/208/28doi:10.26093/cds/vizier.22080028CDSSzegedi-Elek E.Kun M.Reipurth B.Pal A.Balazs L.G.Willman M.2017-11-28T13:21:42Z2013-12-04T09:27:35ZCDS support team

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

cds-question@unistra.frline-intensitiesinfrared-photometryvisible-astronomyphotometryspectroscopyyoung-stellar-objectsastronomical-object-identificationsurveysWe present results from an H{alpha} emission line survey in a 1 deg^2^ area centered on the Orion Nebula Cluster, obtained with the Wide Field Grism Spectrograph 2 on the 2.2 m telescope of the University of Hawaii. We identified 587 stars with H{alpha} emission, 99 of which, located mainly in the outer regions of the observed area, have not appeared in previous H{alpha} surveys. We determined the equivalent width (EW) of the line and, based on this, classified 372 stars as classical T Tauri stars (CTTSs) and 187 as weak-line T Tauri stars (WTTSs). Simultaneous r', i' photometry indicates a limiting magnitude of r' ~ 20 mag, but the sample is incomplete at r' > 17 mag. The surface distribution of the H{alpha} emission stars reveals a clustered population and a dispersed population, the former consisting of younger and more massive young stars than the latter. Comparison of the derived EWs with those found in the literature indicates variability of the H{alpha} line. We found that the typical amplitudes of the variability are not greater than a factor of two to three in most cases. We identified a subgroup of low-EW stars with infrared signatures indicative of optically thick accretion disks. We studied the correlations between the EW and other properties of the stars. Based on literature data, we examined several properties of our CTTS and WTTS subsamples and found significant differences in mid-infrared color indices, average rotational periods, and spectral energy distribution characteristics of the subsamples.2013ApJS..208...28Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/208/28CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/319 : UKIDSS-DR9 LAS, GCS and DXS Surveys (Lawrence+ 2012)II/311 : WISE All-Sky Data Release (Cutri+ 2012)II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)III/177 : H-alpha emission stars in the Orion region (Wiramihardja+ 1993)V/73 : Emission-Line Stars of the Orion Population (Herbig+ 1988)II/309 : Halpha emission stars in the Orion Nebula (Parsamian+, 1982)II/171 : Parenago Catalog of Stars in Orion Nebula (Parenago 1954)J/ApJ/733/50 : MIR phot. monitoring of the ONC (Morales-Calderon+, 2011)J/A+A/533/A38 : Extinction map of OMC-1 (Scandariato+, 2011)J/ApJS/183/261 : Optical photometry of the ONC (Da Rio+, 2009)J/ApJ/677/401 : Xray properties of protostars in ONC (Prisinzano+, 2008)J/ApJ/676/1109 : Velocities of stars in the ONC (Furesz+, 2008)J/AJ/136/2136 : HST/ACS Atlas of Great Orion Nebula proplyds (Ricci+, 2008)J/ApJ/671/605 : NGC 2264 and ONC PMS stars in the infrared (Cieza+, 2007)J/ApJS/160/450 : X-ray emission in ONC young stars (Flaccomio+, 2005)J/ApJS/160/319 : COUP: observations and source lists (Getman+, 2005)J/A+A/396/513 : Stellar Rotation in the Orion Nebula Cluster (Herbst+, 2002)J/ApJ/574/258 : X-ray-emitting young stars in the ONC (Feigelson+, 2002)J/AJ/121/3160 : JHK photometry near the Trapezium region (Carpenter+, 2001)J/AJ/121/1676 : ONC low-mass stars photometry (Rebull+, 2001)J/AJ/119/3026 : Circumstellar disk candidates in Orion (Rebull+, 2000)J/AJ/116/1816 : JHKLMNOPQ photometry in Orion cluster (Hillenbrand+, 1998)J/AJ/113/1733 : Orion Nebula Cluster population (Hillenbrand 1997)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/208/28https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/208/28http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/208/28https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/208/28https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/208/28http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/208/28GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/208/28/table1 (H{alpha} emission stars classified as classical T Tauri stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/208/28/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/208/28/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/208/28/table1?GETtext/xml+votable180.050000true83.3876667-5.198750.005555555555555556Cone search capability for table J/ApJS/208/28/table2 (H{alpha} emission stars classified as weak-line T Tauri stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/208/28/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/208/28/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/208/28/table2?GETtext/xml+votable180.050000true83.39125-5.55733330.005555555555555556Cone search capability for table J/ApJS/208/28/table3 (H{alpha} stars without classification)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/208/28/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/208/28/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/208/28/table3?GETtext/xml+votable180.050000true83.4614167-5.01094440.0055555555555555566/21438 21439 22804 228052.85864675833786e-19 3.5010283109654867e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/208/28?format=asciiOpticalInfrareddefaultJ/ApJS/208/28/table1H{alpha} emission stars classified as classical T Tauri starsSimbadNameSimbad column added by the CDSmeta.idcharCIDCross identification(s)meta.id;phys.atmol.crossSectioncharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint2MASS2MASS identifier (except "d" flagged)meta.id;meta.maincharn_2MASS[*d] New/UKIDSS source (G1)meta.notecharl_EWaLimit flag on EWameta.code.errorcharEWa? Equivalent width measured in 2010/12/31 (G2)0.1nmspect.line.eqWidthfloatnullablee_EWa? Uncertainty in EWa0.1nmstat.errorfloatnullableEWa2? 2nd equivalent width measured in 2010/12/31 (G2)0.1nmspect.line.eqWidthfloatnullablee_EWa2? Uncertainty in EWa20.1nmstat.errorfloatnullableEWb? Equivalent width measured in 2011/01/02 (G2)0.1nmspect.line.eqWidthfloatnullablee_EWb? Uncertainty in EWb0.1nmstat.errorfloatnullableEWb2? 2nd equivalent width measured in 2011/01/02 (G2)0.1nmspect.line.eqWidthfloatnullablee_EWb2? Uncertainty in EWb20.1nmstat.errorfloatnullablel_EWcLimit flag on EWcmeta.code.errorcharEWc? Equivalent width measured in 2011/01/25 (G2)0.1nmspect.line.eqWidthfloatnullablee_EWc? Uncertainty in EWc0.1nmstat.errorfloatnullableEWc2? 2nd equivalent width measured in 2011/01/250.1nmspect.line.eqWidthfloatnullablee_EWc2? Uncertainty in EWc20.1nmstat.errorfloatnullableEWd? Equivalent width measured in 2011/02/27 (G2)0.1nmspect.line.eqWidthfloatnullablee_EWd? Uncertainty in EWd0.1nmstat.errorfloatnullableEWd2? 2nd equivalent width measured in 2011/02/270.1nmspect.line.eqWidthfloatnullablee_EWd2? Uncertainty in EWd20.1nmstat.errorfloatnullableEWe? Equivalent width measured in 2011/10/16 (G2)0.1nmspect.line.eqWidthfloatnullablee_EWe? Uncertainty in EWe0.1nmstat.errorfloatnullabler'mag? The r' band magnitude converted to SDSS systemmagphot.mag;em.opt.Rfloatnullabler'-i'? The (r'-i') color indexmagphot.color;em.opt.R;em.opt.Ifloatnullable_RAPositions from 2MASS or UGCS names (right ascension part)degpos.eq.ra;meta.main_DEPositions from 2MASS or UGCS names (declination part)degpos.eq.dec;meta.mainJ/ApJS/208/28/table2H{alpha} emission stars classified as weak-line T Tauri starsSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint2MASS2MASS identifier (except "d" flagged)meta.id;meta.maincharf_2MASS[*d+] New, UKIDSS or blended source (G1)meta.codecharl_EWaLimit flag on EWameta.code.errorcharEWa? Equivalent width measured in 2010/12/31 (G2)0.1nmspect.line.eqWidthfloatnullablee_EWa? Uncertainty in EWa0.1nmstat.errorfloatnullablel_EWbLimit flag on EWbmeta.code.errorcharEWb? Equivalent width measured in 2011/01/02 (G2)0.1nmspect.line.eqWidthfloatnullablee_EWb? Uncertainty in EWb0.1nmstat.errorfloatnullablel_EWcLimit flag on EWcmeta.code.errorcharEWc? Equivalent width measured in 2011/01/25 (G2)0.1nmspect.line.eqWidthfloatnullablee_EWc? Uncertainty in EWc0.1nmstat.errorfloatnullableEWd? Equivalent width measured in 2011/02/27 (G2)0.1nmspect.line.eqWidthfloatnullablee_EWd? Uncertainty in EWd0.1nmstat.errorfloatnullableEWe? Equivalent width measured in 2011/10/16 (G2)0.1nmspect.line.eqWidthfloatnullablee_EWe? Uncertainty in EWe0.1nmstat.errorfloatnullabler'mag? The r' band magnitude converted to SDSS systemmagphot.mag;em.opt.Rfloatnullabler'-i'? The (r'-i') color indexmagphot.color;em.opt.R;em.opt.IfloatnullableCIDCross identification(s)meta.id;phys.atmol.crossSectionchar_RAPositions from 2MASS or UGCS names (right ascension part)degpos.eq.ra;meta.main_DEPositions from 2MASS or UGCS names (declination part)degpos.eq.dec;meta.mainJ/ApJS/208/28/table3H{alpha} stars without classificationrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint2MASS2MASS name (JHHMMSSss+DDMMSSs)meta.id;meta.maincharf_2MASS[*] New source (G1)meta.codecharCIDCross identification(s)(s)meta.id;phys.atmol.crossSectioncharSimbadSimbad column added by the CDSmeta.ref.urlchar_RAPositions from 2MASS names (right ascension part)degpos.eq.ra;meta.main_DEPositions from 2MASS names (declination part)degpos.eq.dec;meta.main