J/ApJ/844/138ivo://CDS.VizieR/J/ApJ/844/138doi:10.26093/cds/vizier.18440138CDSKounkel M.Hartmann L.Mateo M.Bailey III J.I.2021-02-23T13:23:31Z2018-04-10T15:09:52ZCDS support team

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

cds-question@unistra.frvisible-astronomyspectroscopyyoung-stellar-objectsmolecular-cloudsinterstellar-mediumradial-velocityline-intensitieseffective-temperatureWe present results from high-resolution optical spectra toward 66 young stars in the Orion B molecular cloud to study their kinematics and other properties. Observations of the H{alpha} and Li I 6707{AA} lines are used to check membership and accretion properties. While the stellar radial velocities of NGC 2068 and L1622 are in good agreement with that of the molecular gas, many of the stars in NGC 2024 show a considerable offset. This could be a signature of either the expansion of the cluster, the high degree of the ejection of the stars from the cluster through dynamical interaction, or the acceleration of the gas due to stellar feedback.2017ApJ...844..138Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/844/138CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVI/120 : High-resolution synthetic stellar library (Coelho+, 2005)J/A+A/337/403 : Low-mass stars evolutionary models (Baraffe+ 1998)J/A+A/442/1127 : Library of 2500-10500{AA} synthetic spectra (Munari+, 2005)J/ApJ/648/1090 : Radial velocities of NGC 2264 stars (Furesz+, 2006)J/ApJ/646/1215 : Low-mass stars and brown dwarfs in NGC 2024 (Levine+, 2006)J/ApJ/676/1109 : Velocities of stars in the ONC (Furesz+, 2008)J/AJ/135/966 : Circumstellar disk evolution in NGC 2068/71 (Flaherty+, 2008)J/A+A/504/461 : YSOs in L1630N and L1641 (Fang+, 2009)J/ApJ/697/1103 : Kinematics of Orion Nebula Cluster (Tobin+, 2009)J/AJ/144/192 : Spitzer survey of Orion A & B. I. YSO catalog (Megeath+, 2012)J/ApJ/787/109 : Age estimates for NGC 2024 and ONC stars (Getman+, 2014)J/AJ/149/119 : Radial velocities of stars in NGC 2264 (Tobin+, 2015)J/ApJ/808/108 : M2FS stellar spectroscopy of Reticulum 2 (Walker+, 2015)J/ApJ/818/59 : IN-SYNC. IV. YSOs in Orion A (Da Rio+, 2016)J/ApJ/821/8 : Spectroscopic binary pop. of ONC and NGC2264 (Kounkel+, 2016)J/ApJ/834/142 : Gould's Belt Dist. Survey (GOBELINS). II. OMC (Kounkel+, 2017)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/844/138https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/844/138http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/844/138https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/844/138https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/844/138http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/844/138GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/844/138/table1 (Dates and configurations of the M2FS observations)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/844/138/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/844/138/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/844/138/table1?GETtext/xml+votable180.050000true85.45-1.9550.005555555555555556Cone search capability for table J/ApJ/844/138/table2 (Sources that were surveyed for the presence of LiI)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/844/138/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/844/138/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/844/138/table2?GETtext/xml+votable180.050000true85.2457083-2.54777780.0055555555555555566/22854 22855 22873 23560https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/844/138?format=asciiOpticaldefaultJ/ApJ/844/138/table1Dates and configurations of the M2FS observationsrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintCatCatalog ID (NGC or "L" for LDN)meta.id;meta.tablecharField[1622/2068] Field identifier (as in table 2)meta.id;obs.fieldintDateUT date of observationtime.epoch;obsnullableRAJ2000Hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of declination (J2000)pos.eq.dec;meta.mainN[3] Number of exposure timemeta.numberintExp[720/1800] Exposure time (xN)stime.duration;obs.exposureintFiltFilter(s)meta.id;instr.filterNsNumber of sources toward this fieldmeta.numberintnullableSimbadSimbad column added by the CDSmeta.ref.urlcharNEDNED column added by the CDSmeta.ref.urlcharJ/ApJ/844/138/table2Sources that were surveyed for the presence of LiISimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqRV number (2533 to 2825 with 2734a,b and 2670a,b)meta.id;meta.maincharRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainRVel[-71/130]? Radial velocitykm/sphys.veloc;pos.heliocentricfloatnullablee_RVel[0.2/8.2]? Uncertainty in RVelkm/sstat.error;spect.dopplerVelocfloatnullableR[2/33]? Tonry & Davis 1979AJ.....84.1511T Signal-to-Noise R valuestat.correlationfloatnullableWLi[0.1/0.9]? Equivalent width of Li I0.1nmspect.line.eqWidthfloatnullableWHa[-33/2.5]? Equivalent width of H{alpha} (1)0.1nmspect.line.eqWidthfloatnullableVHa[109/671]? H{alpha} velocitykm/sspect.dopplerVelocintnullableYSOYSO type (Class III: 50 occurrences; Class II: 48 occurrences)src.classcharf_YSO[d] Flag on YSO (2)meta.codecharRR?Rapid rotator flag (3)meta.codecharTeff[3500/7000]? Effective temperatureKphys.temperature.effectiveintnullableJDJulian Date of observationdtime.epochdoubleOrderOrder used for cross-correlationmeta.code;instr.filterField[1622/2068] Field identifiermeta.id;obs.fieldint2MDisplay the 2MASS data (Cutri+ 2003, II/246) within 3"meta.ref.urlchar