J/ApJS/254/20ivo://CDS.VizieR/J/ApJS/254/20doi:10.26093/cds/vizier.22540020CDSLiu J.Fang M.Tian H.Liu C.Yang C.Xue X.2022-03-21T09:33:52Z2021-09-09T08:14:42ZCDS support team

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

cds-question@unistra.frstellar-associationsstellar-distancestellar-spectral-typesyoung-stellar-objectsstar-forming-regionsIn this work, we present a systematic search for stellar groups in the Taurus field by applying the DBSCAN algorithm to the data from Gaia DR2. We find 22 groups, consisting of 8 young groups (Groups 1-8) at ages of 2-4Myr and distances of ~130-170pc, and 14 old groups (Groups 9-22) at ages of 8-49Myr and distances of ~110-210pc. We characterize the disk properties of group members and find 19 new disk-bearing stars, 8 of which are in the young groups with 11 others belonging to the comparatively old groups at the ages of 8-11Myr. We characterize the accretion properties of the group members with H{alpha} emission lines in their Large Sky Area Multi-Object Fibre Spectroscopic Telescope spectra, and discover one source in Group 10 at an age of 10Myr which still shows accretion activity. We investigate the kinematic relations among the old groups, find that Group 9 is kinematically related to the known Taurus members, and exclude any kinematic relations between Groups 10-22 and the known Taurus members.2021ApJS..254...20Lhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJS/254/20CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toIII/182 : HDE Charts: positions, proper motions (Nesterov+ 1995)II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)II/311 : WISE All-Sky Data Release (Cutri+ 2012)II/349 : The Pan-STARRS release 1 (PS1) Survey - DR1 (Chambers+, 2016)I/345 : Gaia DR2 (Gaia Collaboration, 2018)I/347 : Distances to 1.33 billion stars in Gaia DR2 (Bailer-Jones+, 2018)V/153 : LAMOST DR4 catalogs (Luo+, 2018)V/164 : LAMOST DR5 catalogs (Luo+, 2019)J/A+A/312/439 : New T Tauri stars in Taurus-Auriga (Wichmann+, 1996)J/other/ARA+A/42.685 : Young stars near the Sun (Zuckerman+, 2004)J/AJ/132/2665 : QUEST2 BRI photometry of Taurus-Auriga PMS (Slesnick+, 2006)J/A+A/468/353 : XMM-Newton Extended Survey of Taurus (Guedel+, 2007)J/A+A/504/461 : YSOs in L1630N and L1641 (Fang+, 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/AJ/139/1338 : UV-selected stars in Tau and Upper Sco (Findeisen+, 2010)J/ApJS/196/4 : New young star candidates in Taurus-Auriga (Rebull+, 2011)J/ApJS/208/9 : Intrinsic colors and temperatures of PMS stars (Pecaut+, 2013)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/ApJS/216/26 : GALEX search for TT in Taurus-Auriga (Gomez de Castro+, 2015)J/AJ/153/188 : Spectroscopy of the foreground pop. in Orion A (Fang+, 2017)J/ApJ/838/150 : The Taurus-Auriga ecosystem. I. (Kraus+, 2017)J/A+A/601/A19 : Gaia DR1 open cluster members (Gaia Collaboration+, 2017)J/AJ/153/257 : Comoving stars in Gaia DR1 (Oh+, 2017)J/AJ/154/134 : Planetary-mass brown dwarfs in the Taurus SFR (Esplin+, 2017)J/ApJ/856/23 : BANYAN. XI. The BANYAN {Sigma} algorithm (Gagne+, 2018)J/ApJ/858/41 : PS1 proper-motion survey for BDs. I. Taurus (Zhang+, 2018)J/ApJ/860/43 : BANYAN. XII. New members from Gaia-Tycho data (Gagne+, 2018)J/AJ/156/271 : The stellar membership of the Taurus SFR (Luhman, 2018)J/A+A/623/A72 : Binarity of Hipparcos stars from Gaia (Kervella+, 2019)J/A+A/628/A66 : alpha Persei, Pleiades and Praesepe clusters (Lodieu+, 2019)J/AJ/158/54 : New Taurus members (Esplin+, 2019)J/A+A/638/A85 : 3D view of Taurus with Gaia & Herschel (Roccatagliata+, 2020)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJS/254/20https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJS/254/20http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJS/254/20https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJS/254/20https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJS/254/20http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJS/254/20GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJS/254/20/table2 (A list of the groups identified in this work)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/254/20/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/254/20/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/254/20/table2?GETtext/xml+votable180.050000true65.2227.910.005555555555555556Cone search capability for table J/ApJS/254/20/table1 (A list of members in each group)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJS/254/20/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJS/254/20/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJS/254/20/table1?GETtext/xml+votable180.050000true67.1775927.23450.0055555555555555565/86 92 259-260 268 270 277-278 292 5887 6037 6039 6047-6049 6056 6069 6071 6088 6/262-263 268-270 272 280-281 283 305 310 324 327 329-331 335-338 342-343 350 358-359 365 372 377 380 1029-1031 1033 1047-1048 1050-1052 1054 1061 1063 1068-1069 1076 1078 1086 1102 1106 1116-1117 1119-1120 1122 1124-1125 1128 1130-1131 1133 1136 1144 1156-1157 1159 1174-1175 1178 1180 1182-1183 1216 1218 1224 1280 1283 23517-23518 23527 23538 23542-23546 23795 23801 23803 23806-23807 24107-24109 24111 24120 24122 24143 24145 24152-24153 24172-24173 24176 24178 24181-24184 24202 24205 24207-24209 24218-24220 24228 24233 24237-24239 24249-24251 24269 24273-24275 24281 24283 24292-24294 24300 24305-24306 24308 24310 24314 24320 24322 24328 24332 24356 24358-24361 24363-24364 24366-24367 24448-24449 24452-24454 24462 24490-24491https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJS/254/20?format=asciidefaultJ/ApJS/254/20/table2A list of the groups identified in this workGroup[1/22] Group numbermeta.id;meta.mainintprimaryNm[7/57] Number of membersmeta.numberintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNspt[0/55] Number of members with literature spectral types (1)meta.numberintONameOther name for Group (2)meta.idcharRAJ2000Mean Group Right Ascension (J2000)degpos.eq.ra;meta.mainDEJ2000Mean Group Declination (J2000)degpos.eq.dec;meta.mainpmRA[-2.4/24] Mean Group proper motion, Right Ascensionmas/yrpos.pm;pos.eq.rafloatpmDE[-37/-14] Mean Group proper motion, Declinationmas/yrpos.pm;pos.eq.decintDist[109/211] Mean Group distancepcpos.distance;pos.heliocentricintE_Dist[3/15] Upper uncertainty on Distpcstat.error;stat.maxinte_Dist[2/22] Lower uncertainty on Distpcstat.errorintAge1[2/49] Age, individual extinction(s) (3)Myrtime.ageintAge2[2/59] Age, group extinction (4)Myrtime.ageintAJ[0.02/0.6] Mean Group J-band extinctionmagphys.absorptionfloatJ/ApJS/254/20/table1A list of members in each groupSimbadNameSimbad column added by the CDSmeta.idcharnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintGroup[1/22] Group number as in Table 2meta.id.parentintSeq[1/630] Sequential running numbermeta.idintNameObject namemeta.id;meta.maincharRA_ICRS[55/90] Right Ascension (ICRS) at Epoch=J2000 (1)degpos.eq.ra;meta.mainDE_ICRS[12/32.5] Declination (ICRS) at Epoch=J2000 (1)degpos.eq.dec;meta.mainDist[101.4/218.2] Gaia DR2 distancepcpos.distance;pos.heliocentricfloatSpTSpectral typesrc.spTypecharr_SpT[1/14]? Spectral type reference (2)meta.ref;pos.frameintnullableMmStatus of membership (3)meta.code.membercharDisk[5/18]? References for disk signatures (2)meta.bibintnullablef_Disk[f] Flags on unconfirmed stars (4)meta.codecharEWHa[1/271.3]? LAMOST H{alpha} equivalent widths, in Angstroms units0.1nmspect.line.eqWidth;spect.linefloatnullableTTS[CW] Classical or Weak-lined T-Tauri categorization (5)meta.notecharAJ[0/1.7] J-band extinction used in this workmagphys.absorptionfloatE19Display data from Esplin+ 2019, J/AJ/158/54 within 1"meta.ref.urlintnullableR20Display data from Roccatagliata+, 2020, J/A+A/638/A85 within 3"meta.ref.urlintnullableGaiaDisplay the Gaia DR2 data (I/345) within 3"meta.ref.urlcharLAMOSTDisplay the LAMOST DR4 (V/153) and DR5 (V/164) within 1"meta.ref.urlchar2MDisplay 2MASS data (Cat. II/246) within 3"meta.ref.urlchar_RA.icrsRight ascension (ICRS) at Epoch=J2000. (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.ranullableindexed_DE.icrsDeclination (ICRS) at Epoch=J2000. (computed by VizieR, not part of the original data. The format may include more digits than the original data because of internal accuracy requirements in VizieR and across other CDS services)degpos.eq.decnullableindexed