J/AJ/154/14ivo://CDS.VizieR/J/AJ/154/14doi:10.26093/cds/vizier.51540014CDSSuarez G.Downes J.J.Roman-Zuniga C.Covey K.R.Tapia M.,Hernandez J.Petr-Gotzens M.G.Stassun K.G.Briceno C.2017-11-03T14:01:56Z2017-09-29T08:12:28ZCDS support team

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

cds-question@unistra.fropen-star-clustersm-starsinfrared-photometryvisible-astronomyphotometrybroad-band-photometryspectroscopystellar-spectral-typesline-intensitieseffective-temperaturestellar-massesstellar-agesThe Orion OB1a sub-association is a rich low-mass star (LMS) region. Previous spectroscopic studies have confirmed 160 LMSs in the 25 Orionis stellar group (25 Ori), which is the most prominent overdensity of Orion OB1a. Nonetheless, the current census of the 25 Ori members is estimated to be lower than 50% complete, leaving a large number of members to be still confirmed. We retrieved 172 low-resolution stellar spectra in Orion OB1a observed as ancillary science in the SDSS-III/BOSS survey, for which we classified their spectral types and determined physical parameters. To determine memberships, we analyzed the H{alpha} emission, LiI{lambda}6708 absorption, and NaI{lambda}{lambda}8183,8195 absorption as youth indicators in stars classified as M type. We report 50 new LMSs spread across the 25 Orionis, ASCC18, and ASCC20 stellar groups with spectral types from M0 to M6, corresponding to a mass range of 0.10{<=}m/M_{Sun}_{<=}0.58. This represents an increase of 50% in the number of known LMSs in the area and a net increase of 20% in the number of 25 Ori members in this mass range. Using parallax values from the Gaia DR1 catalog, we estimated the distances to these three stellar groups and found that they are all co-distant, at 338+/-66pc. We analyzed the spectral energy distributions of these LMSs and classified their disks into evolutionary classes. Using H-R diagrams, we found a suggestion that 25 Ori could be slightly older than the other two observed groups in Orion OB1a.2017AJ....154...14Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/154/14CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/147 : The SDSS Photometric Catalogue, Release 12 (Alam+, 2015)II/328 : AllWISE Data Release (Cutri+ 2013)V/139 : The SDSS Photometric Catalog, Release 9 (Adelman-McCarthy+, 2012)II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)J/MNRAS/450/3490 : New brown dwarfs in Orion OB1a/25 Ori group (Downes+, 2015)J/MNRAS/444/1793 : 25 Ori group low-mass stars (Downes+, 2014)J/A+A/558/A53 : MW global survey of star clusters. II. (Kharchenko+, 2013)J/MNRAS/427/3374 : QUEST RR Lyrae Survey III. (Mateu+, 2012)J/ApJ/671/1784 : Ori OB1 IRAC/MIPS observations (Hernandez+, 2007)J/ApJ/661/1119 : Spectroscopy in the 25 Ori group (Briceno+, 2007)J/AJ/129/907 : New Ori OB1 members (Briceno+, 2005)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/154/14https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/154/14http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/154/14https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/154/14https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/154/14http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/154/14GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/154/14/stars (Photometric catalog (table1), youth indicator (table2), and physical parameters (table3) of the confirmed members of 25 Ori or Orion OB1a)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/154/14/stars?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/154/14/stars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/154/14/stars?GETtext/xml+votable180.050000true81.919313891.065933060.005555555555555556Cone search capability for table J/AJ/154/14/table5 (Stars on the Baryon Oscillation Spectroscopic Survey (BOSS) plate that were rejected as confirmed members of 25 Ori or Orion OB1a)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/154/14/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/154/14/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/154/14/table5?GETtext/xml+votable180.050000true80.842323061.310326110.0055555555555555565/5723 6/22889 22891 22904 22906 22977 22980 22981 22983 229928.988462024794503e-21 6.090060298487514e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/154/14?format=asciiInfraredOpticaldefaultJ/AJ/154/14/starsPhotometric catalog (table1), youth indicator (table2), and physical parameters (table3) of the confirmed members of 25 Ori or Orion OB1aSpTSpectral typesrc.spTypecharzmag[13.48/16.59]? The SDSS z band magnitudemagphot.mag;em.opt.IfloatnullableLbol[0.014/0.312] Bolometric luminositysolLumphys.luminosityfloatrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintStar[66/158] Internal identifier of the confirmed member of 25 Ori or Orion OB1ameta.code.memberintRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainumag[17.56/24.54]? The SDSS u band magnitudemagphot.mag;em.opt.Ufloatnullablegmag[15.97/21.27]? The SDSS g band magnitudemagphot.mag;em.opt.Bfloatnullablermag[14.66/19.64]? The SDSS r band magnitudemagphot.mag;em.opt.Rfloatnullableimag[14.25/17.65]? The SDSS i band magnitudemagphot.mag;em.opt.IfloatnullableDR12Display the SDSS-DR12 data (Alam et al. 2015, Cat. V/147)meta.ref.urlcharDR9Display the SDSS-DR9 data (Adelman-McCarthy et al. 2012, Cat. V/139)meta.ref.urlcharSloanDisplay the online SDSS data for the nearest objectmeta.ref.urlcharVmag[15.19/20.38]? V band magnitude from the Centro de Investigaciones de Astronomia (CIDA) Deep Survey of Orion (CDSO) (1)magphot.mag;em.opt.VfloatnullableRmag[14.33/19.04] R band magnitude from the CDSO (1)magphot.mag;em.opt.RfloatIcmag[13.3/17] I_c_ band magnitude from the CDSO (1)magphot.mag;em.opt.IfloatZmag2[13.2/16.4] Z band magnitude from VISTA (2)magphot.mag;em.opt.IfloatYmag2[12.8/15.7] Y band magnitude from VISTA (2)magphot.mag;em.IR.JfloatJmag2[12.28/15.12] J band magnitude from VISTA (2)magphot.mag;em.IR.JfloatHmag2[11.68/14.64] H band magnitude from VISTA (2)magphot.mag;em.IR.HfloatKsmag2[11.25/14.34] Ks band magnitude from VISTA (2)magphot.mag;em.IR.KfloatJmag1[12.11/15.23] 2MASS J band magnitude (3)magphot.mag;em.IR.JfloatHmag1[11.4/14.7] 2MASS H band magnitude (3)magphot.mag;em.IR.HfloatKsmag1[11/14.5] 2MASS Ks band magnitude (3)magphot.mag;em.IR.Kfloat2MDisplay the 2MASS data (Cutri et al. 2003, Cat. II/246)meta.ref.urlchar[3.6][10/14]? Spitzer/IRAC 3.6{mu}m (channel 1) magnitude (4)magphot.mag;em.IR.3-4umfloatnullable[4.5][9.9/14]? Spitzer/IRAC 4.5{mu}m (channel 2) magnitude (4)magphot.mag;em.IR.4-8umfloatnullable[5.8][9.2/13.9]? Spitzer/IRAC 5.8{mu}m (channel 3) magnitude (4)magphot.flux.density;em.IR.4-8umfloatnullable[8.0][9.1/13.8]? Spitzer/IRAC 8.0{mu}m (channel 4) magnitude (4)magphot.flux.density;em.IR.8-15umfloatnullableW1mag[10.16/14.11] AllWISE W1 (3.35{mu}m) magnitude (5)magphot.mag;em.IR.3-4umfloatW2mag[9.49/13.95] AllWISE W2 (4.6{mu}m) magnitude (5)magphot.mag;em.IR.4-8umfloatW3mag[7.14/12.55] AlLWISE W3 (11.6{mu}m) magnitude (5)magphot.flux.density;em.IR.8-15umfloatW4mag[5/9] AllWISE W4 (22.1{mu}m) magnitude (5)magphot.flux.density;em.IR.15-30umfloatAllWISEDisplay the AllWISE data (Cutri et al. 2013, Cat. II/328)meta.ref.urlchare_SpT[0.4/1.4] Spectral type uncertaintystat.errorfloatEWHa[-247.7/-2] H{alpha} emission equivalent width (in {AA})0.1nmspect.line.eqWidth;em.line.HalphadoubleEWLi[0.079/1.72]? Li I{lambda}6708 absorption equivalent width (in {AA})0.1nmspect.line.eqWidth;em.opt.IfloatnullableNaI[-1/1]? Consistency of NaI{lambda}{lambda}8183,8195 doublet with stellar templates (-1, 0, or 1) (6)meta.codeintnullableVar[a]? Flag for variability candidate (7)meta.codecharAv[0/4.33] Visual extinction (A_V_)magphys.absorption;em.opt.VfloatE_Av[0.183/1.777] Visual extinction upper uncertaintymagstat.error;stat.maxfloate_Av[0/1.873] Visual extinction lower uncertaintymagstat.errorfloatTeff[3030.5/3806.5] Effective temperature (T_eff_)Kphys.temperature.effectivefloatE_Teff[58/196] Effective temperature upper uncertaintyKstat.error;stat.maxfloate_Teff[56/174] Effective temperature lower uncertaintyKstat.error;phys.temperature.effectivefloatE_Lbol[0.01/0.2] Bolometric luminosity upper uncertaintysolLumstat.error;stat.maxfloate_Lbol[0.008/0.221] Bolometric luminosity lower uncertaintysolLumstat.errorfloatMass[0.098/0.573] MasssolMassphys.massfloatE_Mass[0.016/0.115] Mass upper uncertaintysolMassstat.error;stat.maxfloate_Mass[0.019/0.125] Mass lower uncertaintysolMassstat.error;phys.massfloatAge[0.506/14.128] AgeMyrtime.agefloatE_Age[0.742/12.817]? Age upper uncertaintyMyrstat.error;stat.maxfloatnullablee_Age[0.116/9.579]? Age lower uncertaintyMyrstat.error;time.agefloatnullableTTST Tauri star (TTS) classification (CTTS or WTTS) (8)src.classcharDiskDisk evolutionary classification (ClassII, ClassIII, Evolved, or TDC=Transitional Disk Candidate) (9)meta.code.classcharGroupStellar group designation (25 Ori, ASCC 18, ASCC 20 or outside these groups) (10)meta.id;phys.atmol.configuration;pos.lgcharH07Number of sources in Hernandez et al. 2007 (Cat. J/ApJ/671/1784) within 1.5''meta.ref.urlintnullableD14Number of sources in Downes et al. 2014 (Cat. J/MNRAS/444/1793) within 1.5''meta.ref.urlintnullableJ/AJ/154/14/table5Stars on the Baryon Oscillation Spectroscopic Survey (BOSS) plate that were rejected as confirmed members of 25 Ori or Orion OB1aSpTSpectral typesrc.spTypecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.maine_SpT[0.5/8.3]? Spectral type uncertaintystat.errorfloatnullablef_SpT[a] Spectral type reference (1)meta.codecharImag[13/19.5]? I_c_ magnitude from the Centro de Investigaciones de Astronomia (CIDA) Deep Survey of Orion (CDSO) catalog (Downes et al. 2014, Cat. J/MNRAS/444/1793)magphot.mag;em.opt.IfloatnullableI-J[0/1.747]? Ic-J color index from the CIDA Deep Survey of Orion (CDSO) and VISTA catalogsmagphot.color;em.IR;em.IRfloatnullable