J/AJ/129/363ivo://CDS.VizieR/J/AJ/129/363doi:10.26093/cds/vizier.51290363CDSSicilia-Aguilar A.Hartmann L.W.Szentgyorgyi A.H.Fabricant D.G.,Furesz G.Roll J.Conroy M.A.Calvet N.Tokarz S.Hernandez J.2017-11-28T13:21:23Z2005-09-24T21:25:19ZCDS support team

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

cds-question@unistra.fraccretionpre-main-sequence-starsopen-star-clustersline-intensitiesradial-velocityWe present results from high-resolution spectra of 237 stars in the Orion Nebula cluster (ONC) obtained during two engineering runs with the Hectochelle multifiber echelle spectrograph on the 6.5m MMT. The ONC is the nearest populous young (age ~1Myr) cluster and is therefore an important object for studies of the evolution of protoplanetary disks. Using the high spectral resolution of Hectochelle, we are able to distinguish stellar accretion and wind emission-line profiles from nebular emission lines and identify accreting members of the cluster from H{alpha} profiles with greater accuracy than previously possible. We find 15 new members on the basis of Li {lambda}6707 absorption and H{alpha} emission. Line profiles of H{alpha} of some objects that are not too contaminated by nebular emission show features characteristic of mass inflow and ejection. We also present rotational velocities as part of an initial investigation into angular momentum evolution of very young stars, confirming a difference between classical T Tauri stars and weak-line T Tauri stars that had been found from period analysis. Finally, we present an initial study of the radial velocity dispersion of the brighter stars in the central cluster. The very small dispersion derived, 1.8km/s, is in good agreement with estimates from proper motions.2005AJ....129..363Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/129/363CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/113/1733 : Orion Nebula Cluster population (Hillenbrand 1997)J/AJ/116/1816 : JHKLMNOPQ photometry in Orion cluster (Hillenbrand+, 1998)J/A+A/396/513 : Stellar Rotation in the Orion Nebula Cluster (Herbst+, 2002)II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/129/363https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/129/363http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/129/363https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/129/363https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/129/363http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/129/363GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/129/363/table1 (Results from 2003 December)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/129/363/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/129/363/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/129/363/table1?GETtext/xml+votable180.050000true83.621833-5.3990830.005555555555555556Cone search capability for table J/AJ/129/363/table2 (Results from March 2004)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/129/363/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/129/363/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/129/363/table2?GETtext/xml+votable180.050000true83.6188333-5.41605560.0055555555555555566/21438 21439 22804 22805https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/129/363?format=asciiOpticaldefaultJ/AJ/129/363/table1Results from 2003 DecemberrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[H97b]? Identification number (G1)intnullablem_[H97b]Multiple componentscharSpTypeHillenbrand et al. (1998, Cat. <J/AJ/116/1816>) spectral typecharType[CW: ] Type T Tauri star classification (G2)charEW(Li)? Equivalent width of Li (6707 Angstroms) in Angstroms0.1nmfloatnullableu_EW(Li)Uncertainty flag in EW(Li)charEW(Ha)? Equivalent width of H{alpha} in AngstromsnmfloatnullableComAdditional comments (1)char_RAPosition (from name) (right ascension part)degpos.eq.ra;meta.main_DEPosition (from name) (declination part)degpos.eq.dec;meta.main2MASSThe 2MASS identification (HHMMSSss+DDMMSSs)charJ/AJ/129/363/table2Results from March 2004recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[H97b]Identification number (G1)intm_[H97b]Multiple componentscharczHeliocentric radial velocitykm/sfloate_czUncertainty in czkm/sfloatS/N? Signal-to-noise value of cross-correlation peak (see text)floatnullablevsini? Rotational velocitykm/sfloatnullablee_vsini? Uncertainty in vsinikm/sfloatnullableTypeT Tauri star classification (G2)charEW(Ha)? Equivalent width of H{alpha} in Angstroms0.1nmfloatnullableu_EW(Ha)Uncertainty flag in EW(Ha)charSpTypeSpectral type (1)charComAdditional comments (2)char_RASimbad column added by the CDSdegpos.eq.ra;meta.main_DESimbad column added by the CDSdegpos.eq.dec;meta.main2MASSThe 2MASS identification (HHMMSSss+DDMMSSs)char