J/AJ/165/205ivo://CDS.VizieR/J/AJ/165/205doi:10.26093/cds/vizier/be-55-6dCDSHernandez J.Zamudio L.F.Briceno C.Calvet N.Zhu Z.Yuan H.,Liu X.Manzo-Martinez E.Roman-Zuniga C.G.Serna J.Mauco K.,Adame L.2026-07-02T11:44:24Z2023-10-13T07:10:12ZCDS support team

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

cds-question@unistra.frvariable-starsstar-forming-regionsvisible-astronomyspectroscopyextinctionstellar-agesstellar-massesWe present a spectroscopic analysis of TTauri stars (TTSs) observed with the wide-field multifiber spectrograph LAMOST in the substellar associations Ori OB1a located in the Orion Star-forming Complex. Based on GAIA-DR3 data, we selected stars with proper motions and parallaxes expected for TTSs belonging to the young association. We perform a spectroscopic analysis to obtain the spectral types and measure the equivalent widths of LiI and H{alpha} to confirm the youth of the stars and estimate the accretion status. We also estimate extinctions, masses, and ages for the studied sample. Out of 342 TTSs with spectroscopic and kinematic properties indicating their membership of the subassociation, 2 are reported here for the first time. Finally, we detect four stellar kinematic groups located at different distances, two in the north fields and two in the south field. These groups also show different proper motions. This suggests that the star-forming scenario in this region is more complex than the traditional spatial-temporal scenario, in which a generation of stars triggers the formation of a new spatially differentiated generation of stars.2023AJ....165..205Hhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/165/205CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/36 : UBV and uvby-beta observations of Orion OB1 Association (Warren+ 1977)I/317 : The PPMXL Catalog (Roeser+ 2010)I/352 : Distances to 1.47 billion stars in Gaia EDR3 (Bailer-Jones+, 2021)V/137 : Extended Hipparcos Compilation (XHIP) (Anderson+, 2012)J/A+A/289/101 : Orion OB1 association. I. (Brown+, 1994)J/AJ/117/354 : OB associations from Hipparcos (de Zeeuw+, 1999)J/AJ/123/387 : VRI photometry {lambda}Ori star-forming region (Dolan+, 2002)J/AJ/128/2316 : BVRIJHKs photometry in sigma Ori cluster (Sherry+, 2004)J/AJ/129/907 : New Ori OB1 members (Briceno+, 2005)J/AJ/129/856 : Herbig Ae/Be stars in nearby OBassociations (Hernandez+, 2005)J/A+A/440/403 : 109 new Galactic open clusters (Kharchenko+, 2005)J/ApJS/179/451 : Predicted IR excesses for protoplanetary disks (Kenyon+, 2008)J/ApJ/688/362 : Disks around brown dwarf in {sigma}Ori cluster (Luhman+, 2008)J/ApJS/191/389 : Photometric monitoring in {sigma} Ori cluster (Cody+, 2010)J/ApJ/752/59 : Low-mass population in L1641 (Hsu+, 2012)J/ApJ/758/31 : IR photometry for members of Upper Sco (Luhman+, 2012)J/A+A/558/A53 : Milky Way global survey star clusters. II. (Kharchenko+, 2013)J/ApJS/208/9 : Intrinsic colors and temperatures of PMS stars (Pecaut+, 2013)J/MNRAS/444/1793 : 25 Ori group low-mass stars (Downes+, 2014)J/ApJ/784/126 : IR photometry of all known members in Taurus (Esplin+, 2014)J/ApJ/794/36 : {sigma} Orionis cluster stellar population (Hernandez+, 2014)J/MNRAS/472/3887 : Kinematic data for stars in OB-associations (Melnik+, 2017)J/AJ/156/71 : K2 Campaign 2; young disk-bearing * in Sco & Oph (Cody+, 2018)J/AJ/156/84 : APOGEE-2 survey of Orion Complex. II. (Kounkel+, 2018)J/A+A/620/A172 : Solar neighbourhood young stars 3D mapping (Zari+, 2018)J/AJ/157/85 : The CIDA Variability Survey of Orion OB1. II. (Briceno+, 2019)J/A+A/631/A166 : Members of 5 cluster in Ori OB1a association (Kos+, 2019)J/AJ/158/122 : Local structure &star formation history of MW (Kounkel+, 2019)J/ApJ/884/6 : Known members of Orion A with Gaia DR2 data (McBride+, 2019)J/AJ/158/48 : Speckle interferometry at SOAR in 2018 (Tokovinin+, 2019)J/A+A/633/A99 : Gaia DR2 open clusters in Milky Way. II (Cantat-Gaudin+, 2020)J/AJ/160/44 : Upper Scorpius spectroscopy and photometry (Luhman+, 2020)J/ApJ/893/56 : TTauri star IR excesses & Ha eq widths (Manzo-Martinez+, 2020)J/MNRAS/495/3104 : Runaway and walkaway stars from the ONC (Schoettler+, 2020)J/AJ/160/268 : Infrared photometry binaries in Orion OB1 (Tokovinin+, 2020)J/ApJ/917/23 : SPYGLASS. I. Mapping young stellar structures (Kerr+, 2021)J/A+A/649/A3 : Gaia Early Data Release3 photometric passbands (Riello+, 2021)J/ApJ/923/177 : TESS obs. & rotational periods TTauri in Orion (Serna+, 2021)J/AJ/162/101 : K2 ugri & H{alpha} photometry in Lagoon Nebula (Venuti+, 2021)J/A+A/657/A7 : Stellar & substellar companions Gaia EDR3 (Kervella+, 2022)J/A+A/664/A175 : Milky Way low mass young stars Gaia EDR3 (Prisinzano+, 2022)J/ApJS/258/16 : TESS Eclipsing Binary stars. I. Sectors 1-26 (Prsa+, 2022)J/AJ/163/152 : Stellar parameters for ~650000 stars APOGEE (Sprague+, 2022)J/AJ/163/74 : Census of low accretors. I. The catalog (Thanathibodee+, 2022)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/165/205https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/165/205http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/165/205https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/165/205https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/165/205http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/165/205GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/165/205/stars (Spectroscopy, kinematic, exitinctions, masses and ages fo TTauri stars (Table2 and Table3))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/165/205/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/165/205/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/165/205/stars?GETtext/xml+votable180.050000true78.81217-1.971170.0055555555555555565/5703 5709 5714 5720 5725-5727 5748-5749 5896 5898 6/22806-22807 22809 22811 22833 22835 22844-22845 22850 22862 22879 22884 22886 22888-22889 22893-22895 22897 22899 22980-22981 22983 22989 23000-23001 23003-23005 23562 23680-23682https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/165/205?format=asciiOpticaldefaultJ/AJ/165/205/starsSpectroscopy, kinematic, exitinctions, masses and ages fo TTauri stars (Table2 and Table3)e_AJmag[0/0.3] Uncertainty in AJmagmagstat.error;phot.magfloatTeff[2912/6531] Stellar surface effective temperatureKphys.temperature.effectivefloate_Teff[27/632] Uncertainty in TeffKstat.error;phys.temperature.effectivefloatLum[-2.03/2.66] log, Luminositylog(Sun)phys.luminosityfloate_Lum[0.02/0.4] Uncertainty in logLlog(Sun)stat.errorfloatMass*1[0.14/5.43]? Stellar mass, parsecsolMassphys.massfloatnullableE_Mass*1[0/0.9]? Lower uncertainty in Mass*1solMassstat.error;stat.maxfloatnullablee_Mass*1[0/2]? Upper uncertainty in Mass*1solMassstat.error;phys.massfloatnullableAge1[0.1/233]? Age, parsecMyrtime.agefloatnullableE_Age1[0.02/79]? Lower uncertainty in Age1Myrstat.error;stat.maxfloatnullablee_Age1[0/72]? Upper uncertainty in Age1Myrstat.errorfloatnullablefhd1[-1/1] hd flag PARSEC (2)meta.codeintMass*2[0.12/5.35]? Stellar mass, MISTsolMassphys.massfloatnullableE_Mass*2[0.01/10]? Lower uncertainty in Mass*2solMassstat.error;stat.maxfloatnullablee_Mass*2[0.01/2]? Upper uncertainty in Mass*2solMassstat.error;phys.massfloatnullableAge2[0.01/223]? Age, MISTMyrtime.agefloatnullableE_Age2[0.01/137]? Lower uncertainty in Age2Myrstat.error;stat.maxfloatnullablee_Age2[0/112]? Upper uncertainty in Age2Myrstat.errorfloatnullablefhd2[-1/1] hd flag MIST (2)meta.codeintfclKinematic/Cluster group flag (3)meta.codecharfkinKinematic flag (2)meta.codecharSpTSpectral Typesrc.spTypechare_SpT[0.5/4.5] Uncertainty in SpTstat.errorfloatfLi[0/2] Flag on Li detection (3)meta.codeintEWLi[0/2.1] Equivalent Width, Li0.1nmspect.line.eqWidthfloatEWHa[-70.6/13.6]? Equivalent Width, H{alpha}0.1nmspect.line.eqWidthfloatnullablefaccAccretion-class flag (4)meta.codecharfbfbona fide TTS flag (5)meta.codecharRefReference(s) (6)meta.refcharfph[0/1] Gaia EDR3 ph_flag (1)meta.codeintAJmag[0/1.43] J-band extinctionmagphys.absorption;em.IR.JfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint2MASS2MASS Position-based identifiermeta.id;meta.maincharCVSOCIDA Variability Survey of Orion identifiermeta.idcharGaiaGaia EDR3 identifiermeta.idRAJ2000[78/88] Right Ascension (J2000)degpos.eq.ra;meta.mainDEJ2000[-5/7] Declination (J2000)degpos.eq.dec;meta.mainRUWE[0.91/31.5]? Gaia EDR3 RUWE metricstat.errorfloatnullablefid[0.01/1]? Fidelity (1)stat.fit.paramfloatnullableSimbadNameSimbad column added by the CDSmeta.idcharnullable