J/ApJ/799/136ivo://CDS.VizieR/J/ApJ/799/136doi:10.26093/cds/vizier.17990136CDSFoster J.B.Cottaar M.Covey K.R.Arce H.G.Meyer M.R.Nidever D.L.,Stassun K.G.Tan J.C.Chojnowski S.D.da Rio N.Flaherty K.M.,Rebull L.Frinchaboy P.M.Majewski S.R.Skrutskie M.Wilson J.C.,Zasowski G.2017-11-10T11:15:19Z2015-07-16T09:00:28ZCDS support team

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

cds-question@unistra.fryoung-stellar-objectsinfrared-astronomyspectroscopyradial-velocityeffective-temperatureThe initial velocity dispersion of newborn stars is a major unconstrained aspect of star formation theory. Using near-infrared spectra obtained with the APOGEE spectrograph, we show that the velocity dispersion of young (1-2Myr) stars in NGC 1333 is 0.92+/-0.12km/s after correcting for measurement uncertainties and the effect of binaries. This velocity dispersion is consistent with the virial velocity of the region and the diffuse gas velocity dispersion, but significantly larger than the velocity dispersion of the dense, star-forming cores, which have a subvirial velocity dispersion of 0.5km/s. Since the NGC 1333 cluster is dynamically young and deeply embedded, this measurement provides a strong constraint on the initial velocity dispersion of newly formed stars. We propose that the difference in velocity dispersion between stars and dense cores may be due to the influence of a 70{mu}G magnetic field acting on the dense cores or be the signature of a cluster with initial substructure undergoing global collapse.2015ApJ...799..136Fhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/799/136CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/332 : c2d Spitzer final data release (DR4) (Evans+, 2003)II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)J/ApJ/794/125 : IN-SYNC. I. APOGEE spectra in IC348+Pleiades (Cottaar+, 2014)J/ApJS/214/7 : CO survey of molecular clouds. IV. NGC 1333 (Bieging+, 2014)J/MNRAS/434/806 : Pre-main-sequence isochrones. II. SFR (Bell+, 2013)J/AJ/146/133 : Stellar data from SDSS-III APOGEE DR10 (Meszaros+, 2013)J/ApJ/774/22 : CO observations of YSOs in NGC 1333 (Plunkett+, 2013)J/ApJ/744/6 : SONYC census of low-mass objects in NGC1333 (Scholz+, 2012)J/ApJS/190/1 : A survey of stellar families (Raghavan+, 2010)J/AJ/140/266 : NGC 1333 X-ray luminous YSOs properties (Winston+, 2010)J/ApJ/692/973 : Protostars in Perseus, Serpens and Ophiuchus (Enoch+, 2009)J/ApJS/184/18 : Spitzer survey of young stellar clusters (Gutermuth+, 2009)J/AJ/136/1372 : Very low-mass YSOs in NGC 1333 (Oasa+, 2008)J/ApJS/179/249 : Low-luminosity embedded protostar population (Dunham+, 2008)J/ApJS/175/509 : Ammonia spectral atlas in Perseus (Rosolowsky+, 2008)J/ApJ/674/336 : Spitzer observations of NGC 1333 (Gutermuth+, 2008)J/ApJ/668/1042 : Dense cores in Perseus molecular cloud (Kirk+, 2007)J/AJ/127/1131 : NGC 1333 low-mass stars infrared photometry (Wilking+, 2004)J/A+A/401/543 : XMM-Newton observations of NGC 1333 (Preibisch, 2003)J/ApJ/575/354 : Young stellar objects in the NGC 1333 (Getman+, 2002)J/AJ/111/1964 : JHK photometry of NGC1333 (Lada+, 1996)J/A+AS/106/165 : Near-IR imaging photometry of NGC 1333 (Aspin+ 1994)J/A+A/291/943 : Protostellar cores (Ossenkopf+, 1994)http://www.sdss3.org/ : SDSS-III home pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/799/136https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/799/136http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/799/136https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/799/136https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/799/136http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/799/136GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/799/136/table1 (Candidate young stars in NGC 1333)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/799/136/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/799/136/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/799/136/table1?GETtext/xml+votable180.050000true51.918931.26090.0055555555555555566/859 8621.1166583743361574e-19 1.7003137259100215e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/799/136?format=asciiOpticalInfrareddefaultJ/ApJ/799/136/table1Candidate young stars in NGC 1333recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/205] Running sequence numbermeta.idintprimaryParamVelocity, rotation, absolute matnitude, and atmospehric parameters of the star (table3)meta.ref.urlchar2MASS2MASS identifier (HHMMSSss+DDMMSSs; J2000)meta.id;meta.maincharRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainJmag[8.1/18.6] 2MASS J band magnitudemagphot.mag;em.IR.JfloatHmag[7.7/17.8] 2MASS H band magnitudemagphot.mag;em.IR.HfloatKsmag[7.1/15.7] 2MASS K_S_ band magnitudemagphot.mag;em.IR.KfloatNspNumber of spectra with fit parameters (table 2)meta.numberintnullableSimbadSimbad column added by the CDSmeta.ref.urlcharJ/ApJ/799/136/table2Fit parameters for all observed APOGEE Spectra in NGC 1333 (108 stars)recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/204] Object identifiermeta.idintMJDModified Julian Date of the observationdtime.epochdoubleRVel[-1456/390] Fit radial velocitykm/sphys.veloc;pos.heliocentricdoublee_RVel[0.02/2931] Uncertainty in RVelkm/sstat.error;spect.dopplerVelocfloatvsini[0.01/4189] Fit projected rotational velocitykm/sphys.veloc.rotat;meta.modelledfloate_vsini[0.08/3030] Uncertainty in vsinikm/sstat.error;phys.veloc.rotatfloatTeff[400/7000] Fit effective temperatureKphys.temperature.effective;meta.modelledfloate_Teff[0/5130] Uncertainty in TeffKstat.error;phys.temperature.effectivefloatlog(g)[-0.5/5.5] Log of fit surface gravitylog(cm.s**-2)arith.zpfloate_log(g)[0/4.5] Uncertainty in log(g)log(cm.s**-2)stat.errorfloatrH[0/7.9] Fit H-hand veiling valuephys.absorptionfloate_rH[0/22] Uncertainty in rHstat.errorfloatchi2[0.1/135006] Reduced {Chi}^2^ valuestat.valuedoubleS/N[0/420] Signal-to-Noisestat.snrintJ/ApJ/799/136/table3Average parameters for all stars in NGC 1333recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/204] Object identifiermeta.idintRVel[-309.1/98]? Fit radial velocitykm/sphys.veloc;pos.heliocentricfloatnullablee_RVel[0.08/1543]? Uncertainty in RVelkm/sstat.error;spect.dopplerVelocfloatnullablevsini[2/587.1]? Fit projected rotational velocitykm/sphys.veloc.rotat;meta.modelledfloatnullablee_vsini[0.1/1293]? Uncertainty in vsinikm/sstat.error;phys.veloc.rotatfloatnullableTeff[1900/7000]? Fit effective temperatureKphys.temperature.effective;meta.modelledintnullablee_Teff[0/1030]? Uncertainty in TeffKstat.error;phys.temperature.effectiveintnullablelog(g)[-0.3/5.4]? Log of fit surface gravitylog(cm.s**-2)arith.zpfloatnullablee_log(g)[0.02/4.5]? Uncertainty in log(g)log(cm.s**-2)stat.errorfloatnullablerH[0/3.4]? Fit H-hand veiling valuephys.absorptionfloatnullablee_rH[0/12]? Uncertainty in rHstat.errorfloatnullableJMag[-0.6/10.1]? Absolute J band magnitudemagphys.magAbs;em.IR.JfloatnullableNobs[1/7] Number of observationsmeta.numberintNgood[0/7] Number of good observations (1)meta.numberintVar[0/1] Variable flag (1=variable) (2)meta.code;src.varint