J/AJ/130/1733ivo://CDS.VizieR/J/AJ/130/1733doi:10.26093/cds/vizier.51301733CDSWilking B.A.Meyer M.R.Robinson J.G.Greene T.P.2019-10-01T07:25:33Z2006-05-04T22:04:08ZCDS support team

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

cds-question@unistra.fropen-star-clusterspre-main-sequence-starsline-intensitiesWe present the results of optical spectroscopy of 139 stars obtained with the Hydra multiobject spectrograph. The objects extend over a 1.3{deg}^2^ area surrounding the main cloud of the {rho} Oph complex. The objects were selected from narrowband images to have H{alpha} in emission. Using the presence of strong H{alpha} emission, lithium absorption, location in the Hertzsprung-Russell diagram, or previously reported X-ray emission, we were able to identify 88 objects as young stars associated with the cloud. Strong H{alpha} emission was confirmed in 39 objects with line widths consistent with their origin in magnetospheric accretion columns. Two of the strongest emission-line objects are young, X-ray-emitting brown dwarf candidates with M8 spectral types. Comparisons of the bolometric luminosities and effective temperatures with theoretical models suggest a median age for this population of 2.1Myr, which is significantly older than the ages derived for objects in the cloud core. It appears that these stars formed contemporaneously with low-mass stars in the Upper Scorpius subgroup, likely triggered by massive stars in the Upper Centaurus subgroup.2005AJ....130.1733Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/130/1733CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/359/113 : X-ray and IR study of Rho Oph dark cloud (Grosso+, 2000)J/A+A/429/963 : XMM-Newton observation of the rho Oph cloud (Ozawa+, 2005)J/ApJ/613/393 : X-ray and radio sources in {rho} Oph Core A (Gagne+, 2004)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/130/1733https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/130/1733http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/130/1733https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/130/1733https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/130/1733http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/130/1733GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/130/1733/table2 (Optical properties of candidate T Tauri stars)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/130/1733/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/130/1733/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/130/1733/table2?GETtext/xml+votable180.050000true246.23875-24.1898330.0055555555555555566/42959 42981 42983 429922.367228618189496e-19 2.6706780932288093e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/130/1733?format=asciidefaultJ/AJ/130/1733/table2Optical properties of candidate T Tauri starsASpTypeAdopted spectral typesrc.spTypecharNoteAdditional notes (8)meta.notecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqIdentification number (N-NN) (G0)meta.id;meta.maincharprimaryn_SeqIndicates that the source has parameters detailed in tables 3 and 4meta.ref.urlcharNamesSource names (G1)meta.idcharXNameX-Ray source identification (2)meta.id.crosscharRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainCaH? The CaH index (3)spect.indexfloatnullableTiO? The TiO index (4)spect.indexfloatnullableEWLiEquivalent width of Li (5)0.1nmspect.line.eqWidthcharPEWHaPrevious equivalent width if H{alpha} (6)0.1nmspect.line.eqWidthcharEWHa? Equivalent width of H{alpha} (5)0.1nmspect.line.eqWidthfloatnullableIcmag? The Cousins I band magnitudemagphot.mag;em.opt.IfloatnullableRc-Ic? The (Rc-Ic) color indexmagphot.color;em.opt.R;em.opt.IfloatnullablePSpTypePrevious spectral type (7)src.spTypecharSpTypeSpectral typesrc.spTypecharSimbadSimbad column added by the CDSmeta.ref.urlcharJ/AJ/130/1733/table3Gaussian fits to emission lines of T Tauri starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqIdentification number (G0)meta.id;meta.maincharNamesSource names (G1)meta.idcharEWHeI5876? Equivalent width of HeI(5876) (2)0.1nmspect.line.eqWidthfloatnullablef_EWHeI5876Flag on EWHeI5876 (3)meta.codecharFWHMHeI5876? FWHM of HeI(5876)km/sspect.line.widthintnullableEWOI6300? Equivalent width of [OI](6300) (4)0.1nmspect.line.eqWidthfloatnullablef_EWOI6300Flag on EWOI6300 (3)meta.codecharFWHMOI6300? FWHM of [OI](6300) (4)km/sspect.line.widthintnullablel_EWHaLimit flag on EWHameta.code.errorcharEWHaEquivalent width of H{alpha}(6563) (2)0.1nmspect.line.eqWidth;em.line.HalphafloatFWHMHaFWHM of H{alpha}(6563) (2)km/sspect.line.widthintTypeHaH{alpha} type (5)meta.notecharEWHeI6678? Equivalent width of HeI(6678) (2)0.1nmspect.line.eqWidthfloatnullablef_EWHeI6678Flag on EWHeI6678 (3)meta.codecharFWHMHeI6678? FWHM of HeI (6678) (2)km/sspect.line.widthintnullableEWHeI7066? Equivalent width of HeI(7066) (2)0.1nmspect.line.eqWidthfloatnullablef_EWHeI7066Flag on EWHeI7066 (3)meta.codecharFWHMHeI7066? FWHM of HeI(7066) (2)km/sspect.line.widthintnullableEWOI7773? Equivalent width of OI(7773) (2)0.1nmspect.line.eqWidthfloatnullablef_EWOI7773Flag on EWOI7773 (3)meta.codecharFWHMOI7773? FWHM of OI(7773) (2)km/sspect.line.widthintnullablef_FWHMOI7773Flag on FWHMOI7773 (3)meta.codecharEWOI8447? Equivalent width of OI(8447) (2)0.1nmspect.line.eqWidthfloatnullablef_EWOI8447Flag on EWOI8447 (3)meta.codecharFWHMOI8447? FWHM of OI(8447) (2)km/sspect.line.widthintnullableEWCaII8498? Equivalent width of CaII(8498) (2)0.1nmspect.line.eqWidthfloatnullablef_EWCaII8498Flag on EWCaII8498 (3)meta.codecharFWHMCaII8498? FWHM of CaII(8498) (2)km/sspect.line.widthintnullablef_FWHMCaII8498[g] Flag on FWHMCaII8498 (3)meta.codecharEWCaII8542? Equivalent width of CaII(8542) (2)0.1nmspect.line.eqWidthfloatnullablef_EWCaII8542Flag on EWCaII8542 (3)meta.codecharFWHMCaII8542? FWHM of CaII(8542) (2)km/sspect.line.widthintnullablef_FWHMCaII8542[g] Flag on FWHMCaII8542 (3)meta.codecharEWPa14? Equivalent width of Pa 14(8598) (2)0.1nmspect.line.eqWidthfloatnullablef_EWPa14Flag on EWPa14 (3)meta.codecharFWHMPa14? FWHM of Pa 14(8598) (2)km/sspect.line.widthintnullablef_FWHMPa14Flag on FWHMPa14 (3)meta.codecharEWCaII8662? Equivalent width of CaII(8662) (2)0.1nmspect.line.eqWidthfloatnullablef_EWCaII8662Flag on EWCaII8662 (3)meta.codecharFWHMCaII8662? FWHM of CaII(8662) (2)km/sspect.line.widthintnullablef_FWHMCaII8662[g] Flag on FWHMCaII8662 (3)meta.codecharJ/AJ/130/1733/table4Association membersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqIdentification numbermeta.id;meta.maincharNamesSource names (G1)meta.idcharAV? The V band extinctionmagphys.absorption;em.opt.Vfloatnullablef_AV[c] Flag on AV (2)meta.codecharIMAG? Absolute I band magnitudemagphys.magAbs;em.opt.IfloatnullablelogTefflog of the effective temperaturelog(K)phys.temperature.effectivefloatlogLum? log of the luminositylog(solLum)spect.line.eqWidthfloatnullablef_logLum[c] Flag on logLum (2)meta.codecharl_MassLimit flag on Massmeta.code.error;phys.masscharMass? Mass in solar unitssolMassphys.massfloatnullablel_logALimit flag on logAmeta.code.errorcharlogA? log of the agelog(Myr)time.agefloatnullableNoteAdditional notes (3)meta.notechar