J/AJ/154/29ivo://CDS.VizieR/J/AJ/154/29doi:10.26093/cds/vizier.51540029CDSKounkel M.Hartmann L.Calvet N.Megeath T.2017-10-09T08:49:44Z2017-09-29T15:22:40ZCDS support team

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

cds-question@unistra.fropen-star-clustersstellar-spectral-typesline-intensitiesNGC1980 is a young cluster that is located about 0.5{deg} south of the Orion Nebula Cluster (ONC). Recent studies by Bouy et al. and Pillitteri et al. have suggested that NGC1980 contains an older population of stars compared to a much younger ONC, and that it belongs to a foreground population that may be located in front of the Orion A molecular gas by as much as 40pc. In this work, we present low-resolution spectra toward 148 young stars found toward the NGC1980 region. We determine the spectral types of these stars, examine accretion signatures and measure the extinction toward them. We determine that based on these observations, the age of the population of NGC1980 is indistinguishable from L1641, estimated to be ~3Myr, comparable with the study by Fang et al.2017AJ....154...29Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/154/29CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)J/ApJ/834/142 : Gould's Belt Distances Survey (GOBELINS). II. (Kounkel+, 2017)J/ApJ/821/8 : Spectroscopic binaries of ONC and NGC2264 (Kounkel+, 2016)J/ApJ/818/59 : IN-SYNC. IV. YSOs in Orion A (Da Rio+, 2016)J/A+A/564/A29 : Optical and near-infrared photometry in Orion A (Bouy+, 2014)J/ApJ/768/99 : X-ray survey of YSOs in Orion A (Pillitteri+, 2013)J/ApJ/764/114 : BVRI photometry of stars in Orion A (Hsu+, 2013)J/ApJ/753/149 : YSOVAR: 6 Orion eclipsing binaries (Morales-Calderon+, 2012)J/AJ/144/192 : Spitzer survey of Orion A and B. I. (Megeath+, 2012)J/ApJ/722/1092 : Optical photometry of the ONC. II. (Da Rio+, 2010)J/ApJS/183/261 : Optical photometry of the ONC (Da Rio+, 2009)J/ApJ/676/1109 : Velocities of stars in the ONC (Furesz+, 2008)J/ApJ/661/1119 : Spectroscopy in the 25 Ori group (Briceno+, 2007)J/AJ/121/1676 : ONC low-mass stars photometry (Rebull+, 2001)J/AJ/119/3026 : Circumstellar disk candidates in Orion (Rebull+, 2000)J/AJ/113/1733 : Orion Nebula Cluster population (Hillenbrand 1997)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/154/29https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/154/29http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/154/29https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/154/29https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/154/29http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/154/29GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/154/29/table1 (Sources observed toward NGC 1980 with Inamori-Magellan Areal Camera and Spectrograph (IMACS))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/154/29/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/154/29/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/154/29/table1?GETtext/xml+votable180.050000true83.511875-6.09741670.0055555555555555566/21438https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/154/29?format=asciiOpticaldefaultJ/AJ/154/29/table1Sources observed toward NGC 1980 with Inamori-Magellan Areal Camera and Spectrograph (IMACS)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintB14[329411/400107] Identifier from Bouy et al. 2014 (Cat. J/A+A/564/A29)meta.id;meta.mainintRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainSpTSpectral typesrc.spTypechare_SpT[0.5/5.2] Spectral subtype uncertaintystat.errorfloatf_EWHa[0/3]? Flag on EWHa (0, 1, 2, or 3) (1)meta.codeintnullableEWHa[-124.2/4.9]? H{alpha} equivalent width (2)0.1nmspect.line.eqWidth;em.line.Halphafloatnullablee_EWHa[0/33.2]? Uncertainty in EWHa0.1nmstat.errorfloatnullablef_EWLi[0/4]? Flag on EWLi (0, 1, 2, or 4) (1)meta.codeintnullablel_EWLi[<] Upper limit flag on EWLimeta.code.errorcharEWLi[0.1/2.1]? Li I 6707{AA} equivalent width (2)0.1nmspect.line.eqWidth;em.opt.IfloatnullableS/N[1.3/172.8] Spectral Signal-to-Noise/per pixelstat.snrfloatTTS? Accretion type (WTTS or CTTS) (3)src.classcharRef? References (4)meta.refcharAV[0/3.9]? Visual extinction (A_V_)magphys.absorption;em.opt.VfloatnullableField[1/4] Observation field (1, 2, 3, or 4) (5)obs.param;obsintP13Number of sources in Pillitteri et al. 2013 (Cat. J/ApJ/768/99) within 5''meta.ref.urlintnullableH12Number of sources in Hsu et al. 2012 (Cat. J/ApJ/752/59) within 5''meta.ref.urlintnullableF08Number of sources in Furesz et al. 2008 (Cat. J/ApJ/676/1109) within 5''meta.ref.urlintnullableM12Number of sources in Megeath et al. 2012 (Cat. J/AJ/144/192) within 5''meta.ref.urlintnullable2MDisplay the 2MASS data (Cutri et al. 2003, Cat. II/246)meta.ref.urlcharIGSLDisplay the data from the Initial Gaia Source List (IGSL) (Smart et al. 2013, Cat. I/324)meta.ref.urlcharGaiaDisplay the Gaia data (Gaia Collaboration 2016, Cat. I/337)meta.ref.urlchar