J/A+A/629/A114ivo://CDS.VizieR/J/A+A/629/A114doi:10.26093/cds/vizier.36290114CDSCaballero J.A.de Burgos A.Alonso-Floriano F.J.Cabrera-Lavers A.,Garcia-Alvarez D.Montes D.2019-11-27T14:21:33Z2019-09-12T09:27:15ZCDS support team

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

cds-question@unistra.fropen-star-clustersspectroscopybrown-dwarfsOnly a few open clusters are as important for the study of stellar and substellar objects, and their formation and evolution, as the young sigma Orionis cluster. However, a complete spectroscopic characterisation of its whole stellar population is still missing. We filled most of that gap with a large spectroscopic and astrometric survey of targets towards sigma Orionis. Eventually, it will be one of the open clusters with the lowest proportion of interlopers and the largest of confirmed cluster members with known uncontrovertible youth features. We acquired 317 low-resolution optical spectra with IDS at the 2.5m Isaac Newton Telescope and OSIRIS at the 10.4m Gran Telescopio Canarias. On them, we measured equivalent widths of LiI, H{alpha}, and other key lines, and determined spectral types. We complemented the information with Gaia DR2 astrometric data and other features of youth (mid-infrared excess, X-ray emission) compiled with Virtual Observatory tools and from the literature. Of the 168 observed targets, we determined for the first time spectral types of 39 stars and equivalent widths of LiI and H{alpha} of 34 and 12 stars, respectively. We identified 11 close ({rho}<~3-arcsec) binaries resolved by Gaia, of which three are new, 14 strong accretors, of which four are new and another four have H{alpha} emission shifted by over 120km/s, two juvenile star candidates in the sparse population of the Ori OB1b association, and one spectroscopic binary candidate. Remarkably, we found 51 cluster non-members, 35 of which were previously considered as sigma Orionis members and taken into account in high-impact works on, e.g., disc frequency and initial mass function.2019A&A...629A.114Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/629/A114CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/A+A/478/667 : The Mayrit catalogue (Caballero, 2008)J/ApJ/794/36 : sigma Orionis cluster stellar population (Hernandez+, 2014)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/629/A114https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/629/A114http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/629/A114https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/629/A114https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/629/A114http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/629/A114GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/629/A114/tablea1 (Observations of targets with IDS/INT)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/629/A114/tablea1?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/629/A114/tablea1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/629/A114/tablea1?GETtext/xml+votable180.050000true84.238125-2.427750.005555555555555556Cone search capability for table J/A+A/629/A114/tablea2 (Observations of targets with OSIRIS/GTC)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/629/A114/tablea2?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/629/A114/tablea2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/629/A114/tablea2?GETtext/xml+votable180.050000true84.3789583-2.39522220.0055555555555555566/22851 22854-22855 22857 22860-22861https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/629/A114?format=asciidefaultJ/A+A/629/A114/tablea1Observations of targets with IDS/INTSimbadNameSimbad column added by the CDSmeta.idcharObs.date8Date of observationtime.epochnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMayritMayrit identifiermeta.idcharn_Mayrit[)] ) for Mayrit identifier not oldest identifiermeta.notecharANameAlternative star name (1)meta.id;meta.maincharn_AName[*] Note (2)meta.notecharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainpmRA*Proper motion along RA (pmRA*cosDE)mas/yrpos.pm;pos.eq.rafloate_pmRA*rms uncertainty on pmRA*mas/yrstat.error;pos.pm;pos.eq.rafloatpmDEProper motion along DEmas/yrpos.pm;pos.eq.decfloate_pmDErms uncertainty on pmDEmas/yrstat.error;pos.pm;pos.eq.decfloatplx? Parallaxmaspos.parallax.trigfloatnullablee_plx? rms uncertainty on plxmasstat.error;pos.parallaxfloatnullableObs.date1Date of observationtime.epochnullableExpTime1Exposition timestime.duration;obs.exposurecharObs.date2Date of observationtime.epochnullableExpTime2? Exposition timestime.duration;obs.exposureintnullableObs.date3Date of observationtime.epochnullableExpTime3? Exposition timestime.duration;obs.exposureintnullableObs.date4Date of observationtime.epochnullableExpTime4? Exposition timestime.duration;obs.exposureintnullableObs.date5Date of observationtime.epochnullableExpTime5? Exposition timestime.duration;obs.exposureintnullableObs.date6Date of observationtime.epochnullableExpTime6? Exposition timestime.duration;obs.exposureintnullableObs.date7Date of observationtime.epochnullableExpTime7? Exposition timestime.duration;obs.exposureintnullableExpTime8? Exposition timestime.duration;obs.exposureintnullableObs.date9Date of observationtime.epochnullableExpTime9? Exposition timestime.duration;obs.exposureintnullableJ/A+A/629/A114/tablea2Observations of targets with OSIRIS/GTCSimbadNameSimbad column added by the CDSmeta.idcharplx? Parallaxmaspos.parallax.trigfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintMayritMayrit identifiermeta.idcharn_Mayrit[)] ) for Mayrit identifier not oldest identifiermeta.notecharANameAlternative star name (1)meta.id;meta.maincharn_AName[*] Note (2)meta.notecharRAJ2000Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Declination (J2000)pos.eq.dec;meta.mainpmRA*Proper motion along RA (pmRA*cosDE)mas/yrpos.pm;pos.eq.rafloate_pmRA*rms uncertainty on pmRA*mas/yrstat.error;pos.pm;pos.eq.rafloatpmDEProper motion along DEmas/yrpos.pm;pos.eq.decfloate_pmDErms uncertainty on pmDEmas/yrstat.error;pos.pm;pos.eq.decfloate_plx? rms uncertainty on plxmasstat.error;pos.parallaxfloatnullableObs.date1Date of observationtime.epochnullableExpTime1Exposition timestime.duration;obs.exposurecharObs.date2Date of observationtime.epochnullableExpTime2? Exposition timestime.duration;obs.exposureintnullableObs.date3Date of observationtime.epochnullableExpTime3? Exposition timestime.duration;obs.exposureintnullableObs.date4Date of observationtime.epochnullableExpTime4? Exposition timestime.duration;obs.exposureintnullableObs.date5Date of observationtime.epochnullableExpTime5? Exposition timestime.duration;obs.exposureintnullableObs.date6Date of observationtime.epochnullableExpTime6? Exposition timestime.duration;obs.exposureintnullableObs.date7Date of observationtime.epochnullableExpTime7? Exposition timestime.duration;obs.exposureintnullableObs.date8Date of observationtime.epochnullableExpTime8? Exposition timestime.duration;obs.exposureintnullableObs.date9Date of observationtime.epochnullableExpTime9? Exposition timestime.duration;obs.exposureintnullableJ/A+A/629/A114/tablea3Equivalent widths of IDS/INT spectrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar name (1)meta.idcharn_Name[*] *: observed also with the R150V grismmeta.notecharEWHb? Equivalent width of Hbeta 4861.33A line0.1nmspect.line.eqWidthfloatnullablee_EWHb? Lower error of Hbeta equivalent width0.1nmstat.errorfloatnullableE_EWHb? Upper error of Hbeta equivalent width0.1nmstat.error;stat.maxfloatnullableEWHeI? Equivalent width of He I D3 5875.67A line0.1nmspect.line.eqWidthfloatnullablee_EWHeI? Lower error of He I D3 equivalent width0.1nmstat.errorfloatnullableE_EWHeI? Upper error of He I D3 equivalent width0.1nmstat.error;stat.maxfloatnullableEWHa? Equivalent width of Halpha 6562.80A line0.1nmspect.line.eqWidthfloatnullablee_EWHa? Lower error of Halpha equivalent width0.1nmstat.errorfloatnullableE_EWHa? Upper error of Halpha equivalent width0.1nmstat.error;stat.maxfloatnullableEWLiI? Equivalent width of Li I 6707.80A line0.1nmspect.line.eqWidthfloatnullablee_EWLiI? Lower error of Li I equivalent width0.1nmstat.errorfloatnullableE_EWLiI? Upper error of Li I equivalent width0.1nmstat.error;stat.maxfloatnullableSpTypeMILSpectral type derived from MILESsrc.spTypecharSpTypePyHSpectral type derived from PyHammersrc.spTypecharANameAlternative star namemeta.id;meta.maincharJ/A+A/629/A114/tablea4Equivalent widths of OSIRIS/GTC spectrarecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar name (1)meta.idcharn_Name[*] *: were observed by Caballero et al., 2012A&A...546A..59Cmeta.notecharl_EWCaKLimit flag on EWCaKmeta.code.errorcharEWCaK? Equivalent width of Ca K 3933.66{AA} line0.1nmspect.line.eqWidthfloatnullablee_EWCaK? Lower error of Ca K equivalent width0.1nmstat.errorfloatnullableE_EWCaK? Upper error of Ca K equivalent width0.1nmstat.error;stat.maxfloatnullablel_EWCaHLimit flag on EWCaHmeta.code.errorcharEWCaH? Equivalent width of Ca H 3968.47{AA} line0.1nmspect.line.eqWidthfloatnullablee_EWCaH? Lower error of Ca H equivalent width0.1nmstat.errorfloatnullableE_EWCaH? Upper error of Ca H equivalent width0.1nmstat.error;stat.maxfloatnullablel_EWHgLimit flag on EWHgmeta.code.errorcharEWHg? Equivalent width of H{gamma} 4340.47{AA} line0.1nmspect.line.eqWidthfloatnullablee_EWHg? Lower error of H{gamma} equivalent width0.1nmstat.errorfloatnullableE_EWHg? Upper error of H{gamma} equivalent width0.1nmstat.error;stat.maxfloatnullablel_EWHbLimit flag on EWHbmeta.code.errorcharEWHb? Equivalent width of H{beta} 4861.33{AA} line0.1nmspect.line.eqWidthfloatnullablee_EWHb? Lower error of H{beta} equivalent width0.1nmstat.errorfloatnullableE_EWHb? Upper error of H{beta} equivalent width0.1nmstat.error;stat.maxfloatnullableEWHeI? Equivalent width of He I D3 5875.67{AA} line0.1nmspect.line.eqWidthfloatnullablee_EWHeI? Lower error of HeI D3 equivalent width0.1nmstat.errorfloatnullableE_EWHeI? Upper error of HeI D3 equivalent width0.1nmstat.error;stat.maxfloatnullableEWHa? Equivalent width of H{alpha} 6562.80{AA} line0.1nmspect.line.eqWidthfloatnullablee_EWHa? Lower error of H{alpha} equivalent width0.1nmstat.errorfloatnullableE_EWHa? Upper error of H{alpha} equivalent width0.1nmstat.error;stat.maxfloatnullablel_EWLiILimit flag on EWLiImeta.code.errorcharEWLiI? Equivalent width of LiI 6707.80{AA} line0.1nmspect.line.eqWidthfloatnullablee_EWLiI? Lower error of LiI equivalent width0.1nmstat.errorfloatnullableE_EWLiI? Upper error of LiI equivalent width0.1nmstat.error;stat.maxfloatnullableSpTypeMILSpectral type derived from MILESsrc.spTypecharSpTypePyHSpectral type derived from PyHammersrc.spTypecharANameAlternative star namemeta.id;meta.maincharJ/A+A/629/A114/tablea5Membership and youth features of investigated starsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameStar name (1)meta.idcharn_Name[*] Note on Name (4)meta.notecharSpTypeLitSpectral type from the literaturesrc.spTypecharr_SpTypeLitReference for SpTypeLit (2)meta.ref;pos.framecharSpTypeAdoSpectral type adopted from this worksrc.spTypecharfOB[o] Flag for early-type O and B stars (3)meta.codecharfmu[oya] Flag for concordant total proper motion (3)meta.codecharfpi[oya] Flag for concordant parallax (3)meta.codecharfLiI[oxb] Flag for LiI detection in absorption (3)meta.codecharfHalpha[ob] Flag for Halpha detection in emission (3)meta.codecharfmIR[o] Flag for mid-infrared flux excess (3)meta.codecharfX-ray[o] Flag for X-ray emission (3)meta.codecharfMember[+z] Flag for membership in sigma Orionis (3)meta.codecharANameAlternative star namemeta.id;meta.mainchar