J/ApJS/183/261ivo://CDS.VizieR/J/ApJS/183/261doi:10.26093/cds/vizier.21830261CDSDa Rio N.Robberto M.Soderblom D.R.Panagia N.Hillenbrand L.A.,Palla F.Stassun K.2017-09-19T14:21:47Z2010-03-26T06:12:32ZCDS support team

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

cds-question@unistra.frvisible-astronomyh-alpha-photometryinfrared-photometrybroad-band-photometryline-intensitiesm-starssurveysstellar-spectral-typesWe present U, B, V, I broadband, 6200{AA} TiO medium band, and H{alpha} narrow band photometry of the Orion Nebula Cluster (ONC) obtained with the WFI imager at the ESO/MPI 2.2 telescope at La Silla Observatory. The nearly simultaneous observations cover the entire ONC in a field of about 34x34arcmin^2^. They enable us to determine stellar colors avoiding the additional scatter in the photometry induced by stellar variability typical of pre-main-sequence stars. We identify 2612 point-like sources in the I band; 58%, 43%, and 17% of them are also detected in V, B, and U, respectively. 1040 sources are identified in the H{alpha} band. In this paper we present the observations, the calibration techniques adopted, and the resulting catalog. We show the derived color-magnitude diagram of the population and discuss the completeness of our photometry. We define a spectrophotometric TiO index that takes into account the fluxes in the V, I, and TiO bands. Comparing it with spectral types of ONC members in the literature, we find a correlation between the index and the spectral type valid for M-type stars, which is accurate to better than 1 spectral subclass for M3-M6 types and better than 2 spectral subclasses for M0-M2 types. This allows us to newly classify 217 stars.2009ApJS..183..261Dhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/183/261CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/113/1733 : Orion Nebula Cluster population (Hillenbrand 1997)J/AJ/121/1676 : ONC low-mass stars photometry (Rebull+, 2001)J/ApJ/574/258 : Orion nebula X-ray-emitting young stars (Feigelson+, 2002)J/ApJS/160/353 : Membership of the Orion nebula population (Getman+, 2005)J/ApJ/660/704 : Optical and X-ray variability of ONC PMS (Stassun+, 2007)J/ApJ/660/1462 : Abundances of ONC X-ray PMS stars (Maggio+, 2007)J/A+A/502/883 : I phot. of very low mass ONC stars (Rodriguez-Ledesma+, 2009)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/183/261https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/183/261http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/183/261https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/183/261https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/183/261http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/183/261GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/183/261/table4 (New M-type stars classified from the [TiO] index)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/183/261/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/183/261/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/183/261/table4?GETtext/xml+votable180.050000true84.0020417-5.68636110.005555555555555556Cone search capability for table J/ApJS/183/261/table5 (H{alpha} excess)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/183/261/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/183/261/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/183/261/table5?GETtext/xml+votable180.050000true84.0293333-5.571750.005555555555555556Cone search capability for table J/ApJS/183/261/table2 (WFI photometric catalog relative to Night A observations)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/183/261/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/183/261/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/183/261/table2?GETtext/xml+votable180.050000true83.945875-5.29913890.0055555555555555566/21438 21439 22804 22805https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/183/261?format=asciiOpticalInfrareddefaultJ/ApJS/183/261/table4New M-type stars classified from the [TiO] indexrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqRunning numbermeta.id;meta.mainint[DRS2009]Identification number from table2.datmeta.id;meta.mainintRAJ2000hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of declination (J2000)pos.eq.dec;meta.main[TiO]Index of [TiO] (2)magspect.indexfloatSpTSpectral typesrc.spTypechare_SpTUncertainty of spectral typestat.errorfloatJ/ApJS/183/261/table5H{alpha} excessrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqRunning identification numbermeta.id;meta.mainint[DRS2009]Identification number from table2.datmeta.id;meta.mainintRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainEWAH{alpha} equivalent width in Angstroms (1)0.1nmspect.line.eqWidthdoubleEWHzH{alpha} equivalent width in Hertz (1)Hzspect.line.eqWidthdoubleEx.ergH{alpha} excess in erg/s/cm^2^mW.m**-2phot.color.excessdoubleEx.mJyH{alpha} excess in mJymJyphot.color.excessfloatCont.ergH{alpha} continuum in erg/s/cm^2^mW.m**-2phot.flux;em.line.HalphadoubleCont.mJyH{alpha} continuum in mJymJyphot.flux;em.line.HalphafloatJ/ApJS/183/261/table2WFI photometric catalog relative to Night A observationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintn_[DRS2009]Simbad column added by the CDSmeta.ref.urlchar[DRS2009]Identification numbermeta.id;meta.mainintprimaryRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainUmag? U band Vega magnitude (1)magphot.mag;em.opt.Ufloatnullablee_Umag? Error in Umagmagstat.error;phot.mag;em.opt.UfloatnullableBmag? B band Vega magnitude (1)magphot.mag;em.opt.Bfloatnullablee_Bmag? Error in Bmagmagstat.error;phot.mag;em.opt.BfloatnullableVmag? V band Vega magnitude (1)magphot.mag;em.opt.Vfloatnullablee_Vmag? Error in Vmagmagstat.error;phot.mag;em.opt.VfloatnullableTiO? TiO band Vega magnitude (1)magphot.mag;em.opt.Rfloatnullablee_TiO? Error in TiOmagstat.errorfloatnullableImagI band Vega magnitude (1)magphot.mag;em.opt.Ifloate_ImagError in Imagmagstat.error;phot.mag;em.opt.Ifloat[H97b]? Hillenbrand 1997 (Cat. J/AJ/113/1733) catalog identificationmeta.idintnullable