J/ApJ/921/53ivo://CDS.VizieR/J/ApJ/921/53doi:10.26093/cds/vizier.19210053CDSLopez-Valdivia R.Sokal K.R.Mace G.N.Kidder B.T.Hussaini M.,Nofi L.Prato L.Johns-Krull C.M.Oh H.Lee J.-J.Park C.Oh J.S.,Kraus A.Kaplan K.F.Llama J.Mann A.W.Kim H.Gully-Santiago M.A.,Lee H.-I.Pak S.Hwang N.Jaffe D.T.2023-08-25T12:17:41Z2023-03-29T08:19:00ZCDS support team

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

cds-question@unistra.frpre-main-sequence-starsyoung-stellar-objectsinfrared-astronomyspectroscopyeffective-temperaturemagnetic-fieldsWe present fundamental parameters for 110 canonical K- and M-type (1.3-0.13M_{sun}_) Taurus-Auriga young stellar objects (YSOs). The analysis produces a simultaneous determination of effective temperature (Teff), surface gravity (logg), magnetic-field strength (B), and projected rotational velocity (vsini). Our method employed synthetic spectra and high-resolution (R~45000) near-infrared spectra taken with the Immersion GRating INfrared Spectrometer (IGRINS) to fit specific K-band spectral regions most sensitive to those parameters. The use of these high-resolution spectra reduces the influence of distance uncertainties, reddening, and non-photospheric continuum emission on the parameter determinations. The median total (fit+systematic) uncertainties were 170K, 0.28dex, 0.60kG, 2.5km/s for Teff, logg, B, and vsini, respectively. We determined B for 41 Taurus YSOs (upper limits for the remainder) and find systematic offsets (lower Teff, higher logg and vsini) in parameters when B is measurable but not considered in the fit. The average logg for the Class II and Class III objects differs by 0.23+/-0.05dex, which is consistent with Class III objects being the more evolved members of the star-forming region. However, the dispersion in logg is greater than the uncertainties, which highlights how the YSO classification correlates with age (logg), yet there are exceptionally young (lower logg) Class III YSOs and relatively old (higher logg) Class II YSOs with unexplained evolutionary histories. The spectra from this work are provided in an online repository along with TW Hydrae Association comparison objects and the model grid used in our analysis.2021ApJ...921...53Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/921/53CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)I/345 : Gaia DR2 (Gaia Collaboration, 2018)J/ApJS/101/117 : UBVRIJHKLMNQ photometry in Taurus-Auriga (Kenyon+ 1995)J/ApJ/525/466 : Young low-mass stars and BDs in IC 348 (Luhman+, 1999)J/ApJ/593/1093 : IC 348 membership (Luhman+, 2003)J/other/ARA+A/42.685 : Young stars near the Sun (Zuckerman+, 2004)J/AJ/131/1574 : Infrared photometry of IC348 members (Lada+, 2006)J/ApJ/671/1784 : Ori OB1 IRAC/MIPS observations (Hernandez+, 2007)J/MNRAS/389/585 : Fundamental parameters of M dwarfs (Casagrande+, 2008)J/ApJ/704/531 : The coevality of young binary systems (Kraus+, 2009)J/ApJS/186/111 : Spitzer observations of Taurus members (Luhman+, 2010)J/ApJS/186/259 : Taurus Spitzer survey: new candidate members (Rebull+, 2010)J/ApJ/731/8 : Multiple star formation in Taurus-Auriga (Kraus+, 2011)J/ApJ/745/119 : Companions to young stars. I. ChaI & Tau (Nguyen+, 2012)J/ApJ/779/188 : Spectra of nearby late K and M Kepler stars (Mann+, 2013)J/ApJS/208/9 : Intrinsic colors & temperatures of PMS stars (Pecaut+, 2013)J/A+A/556/A15 : Effective temperature scale of M dwarfs (Rajpurohit+, 2013)J/ApJ/794/125 : IN-SYNC. I. APOGEE stellar parameters (Cottaar+, 2014)J/ApJ/784/126 : IR photometry of all known members in Taurus (Esplin+, 2014)J/ApJ/786/97 : Photospheric properties of T Tauri stars (Herczeg+, 2014)J/AJ/147/85 : Solar neighborhood. XXXIII. 45 M dwarfs (Riedel+, 2014)J/A+A/580/A26 : T Tauri star population in Lupus (Galli+, 2015)J/ApJ/804/64 : Empirical and model parameters of 183 M dwarfs (Mann+, 2015)J/ApJ/800/85 : Teff, radii and luminosities of cool dwarfs (Newton+, 2015)J/ApJ/838/150 : The Taurus-Auriga ecosystem. I. (Kraus+, 2017)J/AJ/153/46 : Spectroscopy of candidate members in Taurus (Luhman+, 2017)J/ApJ/859/33 : GOBELINS. IV. VLBA obs. of Taurus (Galli+, 2018)J/AJ/156/271 : The stellar membership of the Taurus SFR (Luhman, 2018)J/A+A/620/A180 : Stellar properties of M dwarfs (Rajpurohit+, 2018)J/ApJ/869/72 : IN-SYNC. VIII. YSOs in NGC1333, IC348 & Orion A (Yao+, 2018)J/ApJ/879/105 : Eff. temperatures of low-mass stars (Lopez-Valdivia+, 2019)J/AJ/162/110 : Gaia EDR3 census of Taurus-Auriga (Krolikowski+, 2021)J/ApJ/911/138 : Low-mass PMS stars in Taurus-Auriga (Nofi+, 2021)http://dataverse.harvard.edu/dataverse/igrins_ysos : IGRINS YSO surveyhttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/921/53https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/921/53http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/921/53https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/921/53https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/921/53http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/921/53GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/921/53/table1 (Compiled information and stellar parameters determined for the 119 stars in our Taurus YSO sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/921/53/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/921/53/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/921/53/table1?GETtext/xml+votable180.050000true63.573373128.10268190.005555555555555556Associated datahttps://cdsarc.cds.unistra.fr/assocdata/?obs_collection=J/ApJ/921/535/270 292 6/342 377 1029 1031 1037 1039-1040 1042 1048 1050-1054 1061 1063 1068 1073-1075 1078 1111 1114 1123-1124 1136 1156 1159 23543 23548-23549 23551 24203 24294-24295 243008.650015785639275e-20 9.710690472292815e-20https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/921/53?format=asciiInfrareddefaultJ/ApJ/921/53/table1Compiled information and stellar parameters determined for the 119 stars in our Taurus YSO samplel_BUpper limit flag on Bmeta.code.errorcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint2MASS2MASS identifier (JHHMMSSss+DDMMSSs)meta.id;meta.maincharNameAlternative object namemeta.idcharKsmag[5.3/10.6] 2MASS (II/246) Ks magnitudemagphot.mag;em.IR.KfloatSpTSpectral type (Luhman+ 2017, J/AJ/153/46)src.spTypecharClassYSO class (84 Class II and 35 Class III)src.classcharr_ClassReferences for YSO class (1)meta.ref;pos.framecharSimbadSimbad column added by the CDSmeta.ref.urlcharBinBinary status ("Y"=48 occurrences; "?"=16 occurrences)meta.codecharr_Bin? Reference for the binary status (1)meta.ref;pos.frameintnullableNep[1/10] Number of epochs combinedmeta.numberintSNR[64/931] K-band median signal-to-noise ratioem.wl.central;stat.medianintFlag[0/3]? Quality flag (0=good) (2)meta.code.errorintnullableTeff[3204/4606]? Effective temperatureKphys.temperature.effectiveintnullablee_Teff[80/437]? Total (fit+systematic) error on the effective temperatureKstat.error;phys.temperature.effectiveintnullablelogg[3.2/4.7]? Surface gravitylog(cm.s**-2)phys.gravityfloatnullablee_logg[0.14/0.7]? Total (fit+systematic) error on the surface gravitylog(cm.s**-2)stat.errorfloatnullableB[0.9/3.3]? Magnetic field strength0.1Tphys.magFieldfloatnullablee_B[0.27/]? Total (fit+systematic) error on the magnetic field strength0.1Tstat.errorfloatnullablevsini[4.6/44]? Projected rotational velocitykm/sphys.veloc.rotatfloatnullablee_vsini[1.7/10]? Total (fit+systematic) error on the projected rotational velocitykm/sstat.error;phys.veloc.rotatfloatnullablerK[0.02/5.53]? K-band veiling (3)phys.absorptionfloatnullablee_rK[0.01/1.1]? Fit error on the K-band veilingstat.errorfloatnullableL17Display data from Luhman+ 2017, J/AJ/153/46meta.ref.urlcharfitsKDownload the K-band spectrum in FITS formatmeta.ref.urlcharfitsHDownload the H-band spectrum in FITS formatmeta.ref.urlcharSpKInteractive K-band spectrum plotmeta.ref.urlcharSpHInteractive H-band spectrum plotmeta.ref.urlchar_RARight Ascension (J2000) from SIMBAD (not part of the original data)degpos.eq.ra;meta.main_DEDeclination (J2000) from SIMBAD (not part of the original data)degpos.eq.dec;meta.main