J/AJ/153/46ivo://CDS.VizieR/J/AJ/153/46doi:10.26093/cds/vizier.51530046CDSLuhman K.L.Mamajek E.E.Shukla S.J.Loutrel N.P.2017-12-13T18:30:22Z2017-10-19T14:49:37ZCDS support team

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

cds-question@unistra.frstellar-associationsdwarf-starsinfrared-astronomyspectroscopystellar-spectral-typesextinctionPrevious studies have found that ~1deg^2^ fields surrounding the stellar aggregates in the Taurus star-forming region exhibit a surplus of solar-mass stars relative to denser clusters like IC 348 and the Orion Nebula Cluster. To test whether this difference reflects mass segregation in Taurus or a variation in the initial mass function, we have performed a survey for members of Taurus across a large field (~40deg^2^) that was imaged by the Sloan Digital Sky Survey (SDSS). We obtained optical and near-infrared spectra of candidate members identified with those images and the Two Micron All Sky Survey, as well as miscellaneous candidates that were selected with several other diagnostics of membership. We have classified 22 of the candidates as new members of Taurus, which includes one of the coolest known members (M9.75). Our updated census of members within the SDSS field shows a surplus of solar-mass stars relative to clusters, although it is less pronounced than in the smaller fields toward the stellar aggregates that were surveyed for previously measured mass functions in Taurus. In addition to spectra of our new members, we include in our study near-IR spectra of roughly half of the known members of Taurus, which are used to refine their spectral types and extinctions. We also present an updated set of near-IR standard spectra for classifying young stars and brown dwarfs at M and L types.2017AJ....153...46Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/153/46CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/328 : AllWISE Data Release (Cutri+ 2013)II/311 : WISE All-Sky Data Release (Cutri+ 2012)II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)III/182 : HDE Charts: positions, proper motions (Nesterov+ 1995)J/MNRAS/453/2220 : Early-type Sco-Cen members with RVs (Murphy+, 2015)J/ApJS/219/33 : BANYAN. VII. Candidate YMG members from BASS (Gagne+, 2015)J/A+A/562/A127 : NIR integral field spectra of 15 M-L dwarfs (Bonnefoy+, 2014)J/ApJ/784/126 : IR photometry of all known members in Taurus (Esplin+, 2014)J/AJ/147/85 : Solar neighborhood. XXXIII. 45 M dwarfs (Riedel+, 2014)J/ApJS/208/9 : Intrinsic colors and temperatures of PMS stars (Pecaut+, 2013)J/ApJ/745/119 : Close companions to young stars. I. ChaI & Tau (Nguyen+, 2012)J/AJ/140/1214 : NIR spectroscopic survey of class I YSOs (Connelley+, 2010)J/ApJS/186/259 : Taurus Spitzer survey: new candidate members (Rebull+, 2010)J/ApJ/703/1511 : Wide binaries in Taurus and Upper Sco (Kraus+, 2009)J/ApJ/676/1281 : L and T dwarfs in 2MASS/SDSS (Metchev+, 2008)J/AJ/136/1290 : Ultracool dwarfs from the 2MASS (Reid+, 2008)J/AJ/134/411 : Properties of IC 348 members (Muench+, 2007)J/ApJ/647/1180 : Infrared photometry of Taurus SFR (Luhman+, 2006)J/ApJ/645/676 : Spatial distribution of brown dwarfs in Taurus (Luhman+, 2006)J/A+A/460/695 : Search for Associations Containing Young stars (Torres+, 2006)J/A+A/446/485 : New very low-mass members in Taurus (Guieu+, 2006)J/AJ/132/2665 : QUEST2 BRI photometry of Taurus-Auriga PMS (Slesnick+, 2006)J/AJ/130/1145 : YSO near-infrared properties (Doppmann+, 2005)J/other/ARA+A/42.685 : Young stars near the Sun (Zuckerman+, 2004)J/ApJ/593/1093 : IC 348 membership (Luhman+, 2003)J/ApJ/525/466 : Young low-mass stars and brown dwarfs in IC348 (Luhman+, 1999)J/A+A/312/439 : New T Tauri stars in Taurus-Auriga (Wichmann+, 1996)J/ApJS/101/117 : UBVRIJHKLMNQ photometry in Taurus-Auriga (Kenyon+ 1995)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/153/46https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/153/46http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/153/46https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/153/46https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/153/46http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/153/46GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/153/46/table4 (Spectral types for known members of TW Hya association (TWA))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/153/46/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/153/46/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/153/46/table4?GETtext/xml+votable180.050000true165.4662717-34.70473140.005555555555555556Cone search capability for table J/AJ/153/46/table5 (Data for construction of standard spectra)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/153/46/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/153/46/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/153/46/table5?GETtext/xml+votable180.050000true154.6195733-31.83411420.005555555555555556Cone search capability for table J/AJ/153/46/table3 (Nonmembers in the spectroscopic sample)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/153/46/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/153/46/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/153/46/table3?GETtext/xml+votable180.050000true63.289958324.67233890.005555555555555556Cone search capability for table J/AJ/153/46/table1 (Members of Taurus)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/153/46/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/153/46/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/153/46/table1?GETtext/xml+votable180.050000true60.955458326.18111110.0055555555555555565/262 268 270 292 6/336 337 342 350 369 374 377 1029 1030 1031 1033 1036 1037 1039 1040 1042 1043 1047 1052 1053 1054 1061 1062 1063 1066 1067 1068 1069 1078 1079 1084 1086 1090 1104 1106 1111 1113 1114 1115 1123 1124 1126 1134 1136 1152 1154 1156 1157 1159 1164 1176 1180 1539 18031 18405 18931 21093 22937 23517 23518 23533 23538 23542 23543 23548 23549 23551 24107 24194 24195 24201 24202 24203 24221 24224 24232 24243 24270 24289 24294 24295 24300 24580 24581 24627 24629 24644 24716 24719 24740 24763 25096 25097 25113 25170 25335 35202 38061 38341 38347 38359 38363 38382 38687 38742 38797 38800 38850 42978 42984 43571 43575 43670 43677 43704 44309 44317 44353 44356 48455https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/153/46?format=asciiInfraredOpticaldefaultJ/AJ/153/46/refsReferencesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRefReference codemeta.noteintBibCodeBibliographic codemeta.bib.bibcodecharAutAuthor's namemeta.bib.authorcharComCommentmeta.notecharJ/AJ/153/46/table4Spectral types for known members of TW Hya association (TWA)SimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintTWATW Hya association (TWA) number (1)meta.id;meta.mainintm_TWATWA component (A or B)meta.code.multipchar2MASS2MASS Point Source Catalog (Cutri et al. 2003, Cat. II/246) source namemeta.idcharONameOther namemeta.idcharSpTSpectral type(s) (2)src.spTypecharr_SpTReference(s); in refs.dat filemeta.ref;pos.framecharASpTAdopted spectral typesrc.spTypecharSpeXData for construction of standard spectra (table5)meta.ref.urlintnullable_RAPosition from Simbad database (right ascension part)degpos.eq.ra;meta.main_DEPosition from Simbad database (declination part)degpos.eq.dec;meta.mainJ/AJ/153/46/table5Data for construction of standard spectraSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameObject name (1)meta.id;meta.maincharASpTAdopted optical spectral typesrc.spTypecharr_ASpTReference(s) for ASpTmeta.ref;pos.framecharDate1Date of SpeX observationtime.epochnullableDate2Second SpeX date, if anytime.epochnullabler_Date2Reference(s) for the dates; in refs.dat filemeta.ref;pos.framecharKnownKnown member of TW Hya association (table4)meta.ref.urlintnullableAjDisplay the extinction in J band (table1)meta.ref.urlintnullable_RAPosition from Simbad database (right ascension part)degpos.eq.ra;meta.main_DEPosition from Simbad database (declination part)degpos.eq.dec;meta.mainJ/AJ/153/46/figure15Standard spectra for classifying young stars and brown dwarfsSpTSpectral typesrc.spTypecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintPopPopulation (younger or older)meta.notecharFileNameName of the FITS spectrum in subdirectory figure15meta.id;meta.fitscharTemplateTemplatemeta.notecharSpPlot the standard spectra from Figure 15 for classifying young stars and brown dwarfs, which have been constructed from the SpeX data listed in Table5meta.ref.urlcharJ/AJ/153/46/table3Nonmembers in the spectroscopic sampleSimbadNameSimbad column added by the CDSmeta.idcharDateDate for the spectroscopytime.epochnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint2MASS2MASS Point Source Catalog (Cutri et al. 2003, Cat. II/246) source namemeta.id;meta.maincharWISEWISE All-Sky Source Catalog (Cutri et al. 2012, Cat. II/311) source namemeta.idcharSpTSpectral typesrc.spTypecharSelBasis of selection for spectroscopy (CMDs or IR) (G1)meta.codecharInstTelescope and instrument for (Gemini/GMOS, Gemini/NIRI, or IRTF/SpeX) (G2)instrchar_RAPosition from Simbad database (right ascension part)degpos.eq.ra;meta.main_DEPosition from Simbad database (declination part)degpos.eq.dec;meta.mainJ/AJ/153/46/table1Members of TaurusFileName3Optical spectra FITS of new and previously known members of Taurus from Figure 3 (the spectra have a resolution of 7 Angstroems. The spectra have not been dereddened)meta.id;meta.filecharFileName4Near-infrared spectra FITS of members of Taurus that lack measured spectral types from Figure 4. These data have a resolution of R=150. The spectra have not been dereddenedmeta.id;meta.filecharFileName5Near-infrared spectra FITS of members of Taurus from Figures 5-11 (the spectra have been dereddened to match the slopes of standards near 1um. These data have a resolution of R=150)meta.id;meta.filecharSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint2MASS2MASS Point Source Catalog (Cutri et al. 2003, Cat. II/246) source namemeta.id;meta.maincharprimaryWISEWISE All-Sky Source Catalog (Cutri et al. 2012, Cat. II/311) source name (1)meta.idcharNewindicates a new member (table2)meta.ref.urlcharRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainName? Source namemeta.idcharSpT? Spectral type(s)src.spTypecharr_SpT? Reference for SpT; in refs.datmeta.ref;pos.framecharDate? Date of SpeX observationtime.epochcharASpT? Adopted spectral typesrc.spTypecharAJ[0/11.4]? Extinction in Jmagphys.absorptionfloatnullablef_AJ? Method of extinction estimation (either 1, 2, 3, 4, 5, 6, 7, CTTS, J-H, J-K, SpeX, edge-on, edge-on?, na, or opt spec) (3)meta.codecharOptPlot the optical spectrum from Figure 3meta.ref.urlcharNIR1Plot the NIR spectrum from Figure 4meta.ref.urlcharNIR2Plot the near-infrared spectrum from Figures 5-11meta.ref.urlcharJ/AJ/153/46/table2New members of Taurus in spectroscopic samplerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint2MASS2MASS Point Source Catalog (Cutri et al. 2003, Cat. II/246) source namemeta.id;meta.maincharf_2MASSFlag for companion on 2MASS (b or c) (1)meta.codecharSpTSpectral typesrc.spTypecharSelectionBasis of selection for spectroscopy (CMDs, H{alpha}, X-ray, IR, pm, WIRCam/IRAC, or companion?) (G1)meta.codeInstTelescope and instrument for the spectroscopy (Gemini/NIRI, HET/LRS, HET/LRS,IRTF/SpeX, or IRTF/SpeX) (G2)instrcharDate1Date for the spectroscopytime.epochnullableDate2Second date for the spectroscopy, if anytime.epochnullable