J/ApJ/822/79ivo://CDS.VizieR/J/ApJ/822/79doi:10.26093/cds/vizier.18220079CDSKun M.Moor A.Szegedi-Elek E.Reipurth B.2018-11-15T12:36:41Z2016-08-19T07:17:39ZCDS support team

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

cds-question@unistra.fryoung-stellar-objectsinfrared-photometryvisible-astronomyWide-band photometryspectroscopystellar-spectral-typesstellar-massesline-intensitiesWe have performed an optical spectroscopic and photometric search for young stellar objects associated with the molecular cloud Lynds 1340, and examined the structure of the cloud by constructing an extinction map, based on SDSS data. The new extinction map suggests a shallow, strongly fragmented cloud, having a mass of some 3700M_{sun}_. Longslit spectroscopic observations of the brightest stars over the area of L1340 revealed that the most massive star associated with L1340 is a B4-type, ~5M_{sun}_ star. The new spectroscopic and photometric data of the intermediate-mass members led to a revised distance of 825_-80_^+110^pc, and revealed seven members of the young stellar population with M>~2M_{sun}_. Our search for H{alpha} emission line stars, conducted with the Wide Field Grism Spectrograph 2 on the 2.2m telescope of the University of Hawaii and covering a 30'x40' area, resulted in the detection of 75 candidate low-mass pre-main sequence stars, 58 of which are new. We constructed spectral energy distributions (SEDs) of our target stars, based on SDSS, 2MASS, Spitzer, and WISE photometric data, derived their spectral types, extinctions, and luminosities from BVRIJ fluxes, estimated masses by means of pre-main sequence evolutionary models, and examined the disk properties utilizing the 2-24{mu}m interval of the SED. We measured the equivalent width of the H{alpha} lines and derived accretion rates. The optically selected sample of pre-main sequence stars has a median effective temperature of 3970K, a stellar mass of 0.7M_{sun}_, and an accretion rate of 7.6x10^-9^M_{sun}_/yr.2016ApJ...822...79Khttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/822/79CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toV/139 : The SDSS Photometric Catalog, Release 9 (Adelman-McCarthy+, 2012)II/297 : AKARI/IRC mid-IR all-sky Survey (ISAS/JAXA, 2010)II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)J/ApJS/224/22 : The YSO population of LDN 1340 in infrared (Kun+, 2016)J/AJ/149/200 : VRI photometry in NGC 7129 (Dahm+, 2015)J/ApJ/795/L26 : Candidate eruptive young stars in Lynds 1340 (Kun+, 2014)J/MNRAS/435/3058 : VIc photom. of IR-excess stars in NGC6611 (De Marchi+ 2013)J/ApJS/208/28 : H{alpha} survey in the ONC (Szegedi-Elek+, 2013)J/ApJS/208/9 : Intrinsic colors and temperatures of PMS stars (Pecaut+, 2013)J/MNRAS/415/103 : IPHAS T Tauri candidates in IC 1396 (Barentsen+, 2011)J/ApJ/733/L8 : Optical and IR photometry of [KOS94] HA11 (Kun+, 2011)J/PASJ/63/S1 : Atlas & catalog of dark clouds based on 2MASS (Dobashi+, 2011)J/AJ/140/462 : Intermediate-mass star-forming regions (Arvidsson+, 2010)J/ApJS/186/111 : Spitzer observations of Taurus members (Luhman+, 2010)J/ApJS/185/451 : PMS stars in the Cepheus flare region (Kun+, 2009)J/ApJS/184/18 : Spitzer survey of young stellar clusters (Gutermuth+, 2009)J/A+A/504/461 : YSOs in L1630N and L1641 (Fang+, 2009)J/AJ/137/4377 : List of SEGUE plate pairs (Yanny+, 2009)J/ApJS/175/277 : Submillimeter-Continuum SCUBA detections (Di Francesco+, 2008)J/A+A/452/245 : Near-IR photometry of PMS stars in rho Oph (Natta+, 2006)J/ApJS/125/161 : A database of dense cores mapped in ammonia (Jijina+, 1999)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/ApJ/822/79https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/822/79http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/822/79https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/822/79https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/822/79http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/822/79GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/822/79/table1 (Log of spectroscopic observations of 23 young star candidates)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/822/79/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/822/79/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/822/79/table1?GETtext/xml+votable180.050000true36.90862572.640750.005555555555555556Cone search capability for table J/ApJ/822/79/emstars (Properties of the H{alpha} emission stars derived from the photometric and EW(H{alpha}) data (tables 2 and 6))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/822/79/emstars?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/822/79/emstars?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/822/79/emstars?GETtext/xml+votable180.050000true36.658208373.08263890.0055555555555555566/3878 38842.4016587514425055e-21 6.118840631666147e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/822/79?format=asciiOpticalInfrareddefaultJ/ApJ/822/79/table1Log of spectroscopic observations of 23 young star candidatesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDSequence number (1)meta.idcharprimarySpTDisplay the results for this starmeta.ref.urlchar2MASS2MASS name (HHMMSSss+DDMMSSs; J2000)meta.id;meta.maincharf_2MASS[a] Flag on 2MASS (2)meta.codecharONameOther identifiermeta.idcharf_OName[b] Flag on OName (2)meta.codecharDateDate of the observationtime.epochnullablelambda1Lower range of wavelength in {AA}0.1nmem.wl;stat.minintlambda2Upper range of wavelength in {AA}0.1nmem.wl;stat.maxintTelTelescope/Instrumentmeta.notecharSimbadSimbad column added by the CDSmeta.ref.urlchar_RAPositions from 2MASS names (right ascension part)degpos.eq.ra;meta.main_DEPositions from 2MASS names (declination part)degpos.eq.dec;meta.mainJ/ApJ/822/79/table3Results for the B, A, and F type stars associated with L1340HRDHertzsprung-Russell Diagram classification (1)src.classcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDSequence number (INN; "I" stands for intermediate-mass young star candidate)meta.idchar2MASS2MASS name (HHMMSSss+DDMMSSs; J2000)meta.id;meta.maincharSpTMK spectral typesrc.spTypecharAvExtinction in the V bandmagphys.absorption;em.opt.VfloatTeffEffective temperatureKphys.temperature.effectiveintE_TeffPositive uncertainty on TeffKstat.error;stat.maxinte_TeffNegative uncertainty on TeffKstat.error;phys.temperature.effectiveintL*Stellar luminositysolLumphys.luminosityfloatE_L*Positive uncertainty on L*solLumstat.error;stat.maxfloate_L*Negative uncertainty on L*solLumstat.errorfloatM*Stellar masssolMassphys.massfloatmagDisplay the UBVRcIcJHKs, Spitzer and AllWISE magnitudes for this star (table9)meta.ref.urlcharJ/ApJ/822/79/table4Spectral types and H{alpha} equivalent widths of the T Tauri type targets of our longslit observations2MASS2MASS name (HHMMSSss+DDMMSSs; J2000)meta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDSequence number (TNN; "T" stands for the T Tauri type candidate)meta.idcharSpTMK spectral typesrc.spTypecharEWHa[16/300] H{alpha} equivalent width obtained with longslit observations (see table 1)0.1nmspect.line.eqWidth;em.line.Halpha;obsfloate_EWHa[0.6/15] EWHa uncertainty0.1nmstat.errorfloatf_EWHa[b,c] Flag on EWHa (1)meta.codecharEW[17/496]? WFGS2 H{alpha} equivalent width (2)0.1nmspect.line.eqWidth;em.line.Halphafloatnullablee_EW[0.8/110]? EW uncertainty0.1nmstat.error;spect.line.eqWidthfloatnullableJ/ApJ/822/79/table9*UBVRcIcJHKs, Spitzer and AllWISE magnitudes of the optically selected candidate YSOs of L1340 (tables 9 and 10)l_22mag[{>=}] Limit flag on 22magmeta.code.errorrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintType[1/2] Stellar type (1)meta.codeintSeq[1/75] Running sequence numbermeta.id;meta.mainintUmag[10.3/27.2] The U band magnitudemagphot.mag;em.opt.Ufloate_Umag[0.005/1.7] Uncertainty in Umagmagstat.error;phot.mag;em.opt.UfloatBmag[10/25] The B band magnitudemagphot.mag;em.opt.Bfloate_Bmag[0.006/0.3] Uncertainty in Bmagmagstat.error;phot.mag;em.opt.BfloatVmag[9.9/21.2] The V band magnitudemagphot.mag;em.opt.Vfloate_Vmag[0.006/0.3] Uncertainty in Vmagmagstat.error;phot.mag;em.opt.VfloatRcmag[9.8/19.9] The Rc band magnitudemagphot.mag;em.opt.Rfloate_Rcmag[0.007/0.05] Uncertainty in Rcmagmagstat.error;phot.mag;em.opt.RfloatIcmag[9.6/19.1] The Ic band magnitudemagphot.mag;em.opt.Ifloate_Icmag[0.007/0.08] Uncertainty in Icmagmagstat.error;phot.mag;em.opt.Ifloatl_Jmag[{<=}] Limit flag on Jmagmeta.code.errorJmag[9.5/16.8]? The 2MASS J band magnitudemagphot.mag;em.IR.Jfloatnullablee_Jmag[0.02/0.2]? Uncertainty in Jmagmagstat.error;phot.mag;em.IR.JfloatnullableHmag[9.5/16.2]? The 2MASS H band magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag[0.02/0.3]? Uncertainty in Hmagmagstat.error;phot.mag;em.IR.HfloatnullableKsmag[9.2/15.4]? The 2MASS Ks band magnitudemagphot.mag;em.IR.Kfloatnullablee_Ksmag[0.01/0.2]? Uncertainty in Ksmagmagstat.error;phot.mag;em.IR.Kfloatnullable3.6mag[7.7/15.3]? Spitzer/IRAC 3.6um band magnitudemagphot.mag;em.IR.3-4umfloatnullablee_3.6mag[0/0.2]? Uncertainty in 3.6magmagstat.errorfloatnullable4.5mag[7/14.6]? Spitzer/IRAC 4.5um band magnitudemagphot.mag;em.IR.4-8umfloatnullablee_4.5mag[0/0.08]? Uncertainty in 4.5magmagstat.errorfloatnullable5.8mag[6.2/14.5]? Spitzer/IRAC 5.8um band magnitudemagphot.flux.density;em.IR.4-8umfloatnullablee_5.8mag[0/0.2]? Uncertainty in 5.8magmagstat.errorfloatnullable8.0mag[5.2/14.3]? Spitzer/IRAC 8.0um band magnitudemagphot.flux.density;em.IR.8-15umfloatnullablee_8.0mag[0/0.09]? Uncertainty in 8.0magmagstat.errorfloatnullable24mag[1.5/9.5]? Spitzer/MIPS 24 micron band magnitudemagphot.flux.density;em.IR.15-30umfloatnullablee_24mag[0/0.2]? Uncertainty in 24magmagstat.errorfloatnullable70mag[-0.2/8.7]? Spitzer/MIPS 70um band magnitudemagphot.flux.density;em.IR.30-60umfloatnullablee_70mag[0.02/0.2]? Uncertainty in 70magmagstat.errorfloatnullable3.4mag[7.5/15.3]? AllWISE W1 (3.4um) band magnitudemagphot.mag;em.IR.3-4umfloatnullablee_3.4mag[0.01/0.04]? Uncertainty in 3.4magmagstat.errorfloatnullable4.6mag[6.6/14.4]? AllWISE W2 (4.6um) band magnitudemagphot.mag;em.IR.4-8umfloatnullablee_4.6mag[0.01/0.05]? Uncertainty in 4.6magmagstat.errorfloatnullablel_12mag[{>=}] Limit flag on 12magmeta.code.error12mag[3.9/12.6]? AllWISE W3 (12um) band magnitudemagphot.flux.density;em.IR.8-15umfloatnullablee_12mag[0.01/0.3]? Uncertainty in 12magmagstat.errorfloatnullable22mag[1.3/9.4]? AllWISE W4 (22um) band magnitudemagphot.flux.density;em.IR.15-30umfloatnullablee_22mag[0.01/0.4]? Uncertainty in 22magmagstat.errorfloatnullableJ/ApJ/822/79/emstarsProperties of the H{alpha} emission stars derived from the photometric and EW(H{alpha}) data (tables 2 and 6)SimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/77] Running sequence numbermeta.idintf_Seq[ab] Flag on Seq (1)meta.codecharNameSource 2MASS or SDSS identifier (HHMMSSss+DDMMSSs or HHMMSS.ss+DDMMSS.s, respectively; J2000)meta.idcharSpTMK spectral type (G1-M3)src.spTypecharAv[0.5/6.5]? Extinction in the V bandmagphys.absorption;em.opt.VfloatnullableTeff[3360/5970]? Effective temperatureKphys.temperature.effectiveintnullableE_Teff[80/430]? Upper uncertainty in TeffKstat.error;stat.maxintnullablee_Teff[80/480]? Lower uncertainty in TeffKstat.error;phys.temperature.effectiveintnullableL*[0.03/14.6]? Stellar luminositysolLumphys.luminosityfloatnullableE_L*[0.02/10.3]? Upper uncertainty in L*solLumstat.error;stat.maxfloatnullablee_L*[0.01/6.1]? Lower uncertainty in L*solLumstat.errorfloatnullableM*[0.3/2.3]? Stellar masssolMassphys.massfloatnullableE_M*[0.04/0.5]? Upper uncertainty in M*solMassstat.error;stat.maxfloatnullablee_M*[0.05/0.5]? Lower uncertainty in M*solMassstat.errorfloatnullablelogMdot[-10.1/-5.8]? Log mass accretion ratelog(solMass.yr**-1)arith.rate;phys.massfloatnullableClassSED class (3)src.classcharTTIndicate more data in table 4 for this T Tauri type targetmeta.ref.urlintnullablef_Name[*] * = SDSS DR9 (V/139) identifiermeta.codecharEW[7.8/496]? H{alpha} equivalent width0.1nmspect.line.eqWidth;em.line.Halphafloatnullablee_EW[0.6/110]? Uncertainty in EW0.1nmstat.error;spect.line.eqWidthfloatnullableONameOther identifier or associated object namemeta.id;meta.maincharAllWISEDisplay AllWISE data (Cutri+, 2013, II/328) within 1"meta.ref.urlcharSloanDisplay the online SDSS data for the nearest objectmeta.ref.urlchar_RAPositions from 2MASS/SDSS names (right ascension part)degpos.eq.ra;meta.main_DEPositions from 2MASS/SDSS names (declination part)degpos.eq.dec;meta.main