J/AJ/149/103ivo://CDS.VizieR/J/AJ/149/103doi:10.26093/cds/vizier.51490103CDSErickson K.L.Wilking B.A.Meyer M.R.Kim J.S.Sherry W.Freeman M.2017-12-22T05:33:33Z2015-07-06T15:24:28ZCDS support team

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

cds-question@unistra.frmolecular-cloudsyoung-stellar-objectsinfrared-photometryvisible-astronomybroad-band-photometrystellar-spectral-typesextinctionline-intensitiesstellar-massesstellar-agesWe have completed an optical spectroscopic survey of a sample of candidate young stars in the Serpens Main star-forming region selected from deep B, V, and R band images. While infrared, X-ray, and optical surveys of the cloud have identified many young stellar objects (YSOs), these surveys have been biased toward particular stages of pre-main sequence evolution. We have obtained over 700 moderate resolution optical spectra that, when combined with published data, have led to the identification of 63 association members based on the presence of H{alpha} in emission, lithium absorption, X-ray emission, a mid-infrared excess, and/or reflection nebulosity. Twelve YSOs are identified based on the presence of lithium absorption alone. An additional 16 objects are classified as possible association members and their pre-main sequence nature is in need of confirmation. Spectral types along with V and R band photometry were used to derive effective temperatures and bolometric luminosities for association members to compare with theoretical tracks and isochrones for pre-main sequence stars. An average age of 2Myr is derived for this population. When compared to simulations, there is no obvious evidence for an age spread when considering the major sources of uncertainties in the derived luminosities. However when compared to the young cluster in Ophiuchus, the association members in Serpens appear to have a larger spread in luminosities and hence ages which could be intrinsic to the region or the result of a foreground population of YSOs associated with the Aquila Rift. Modeling of the spectral energy distributions from optical through mid-infrared wavelengths has revealed three new transition disk objects, making a total of six in the cluster. Echelle spectra for a subset of these sources enabled estimates of vsini for seven association members. Analysis of gravity-sensitive lines in the echelle and moderate resolution spectra of the association members indicate surface gravities consistent with dwarf or sub-giant stars.2015AJ....149..103Ehttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/AJ/149/103CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/691/672 : Spectrocopy of YSOs in Serpens molecular cloud (Oliveira+ 2009)J/ApJ/669/493 : Spitzer/Chandra YSOs in Serpens cloud core (Winston+, 2007)J/A+A/463/275 : Chandra obs. of Serpens star-forming region (Giardino+, 2007)J/A+A/421/623 : ISOCAM survey of YSOs in Serpens Cloud Core (Kaas+, 2004)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/AJ/149/103https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/AJ/149/103http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/AJ/149/103https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/AJ/149/103https://vizier.iucaa.in/viz-bin/votable?-source=J/AJ/149/103http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/AJ/149/103GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/AJ/149/103/table2 (Optical properties of candidate Young Stellar Objects (YSOs) with moderate resolution spectra)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/149/103/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/149/103/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/149/103/table2?GETtext/xml+votable180.050000true277.2433331.183250.005555555555555556Cone search capability for table J/AJ/149/103/table3 (Optical properties of candidate Young Stellar Objects (YSOs) with echelle spectra)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/149/103/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/149/103/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/149/103/table3?GETtext/xml+votable180.050000true277.2341671.1076670.005555555555555556Cone search capability for table J/AJ/149/103/table4 (Association members)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/149/103/table4?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/149/103/table4?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/149/103/table4?GETtext/xml+votable180.050000true277.238751.21750.005555555555555556Cone search capability for table J/AJ/149/103/table5 (Weak criteria sources)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/AJ/149/103/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/AJ/149/103/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/AJ/149/103/table5?GETtext/xml+votable180.050000true277.2366671.3508890.0055555555555555566/30363 30366 30388https://cdsarc.cds.unistra.fr/viz-bin/moc/J/AJ/149/103?format=asciiInfraredOpticaldefaultJ/AJ/149/103/table2Optical properties of candidate Young Stellar Objects (YSOs) with moderate resolution spectraMmSimbad column added by the CDSmeta.code.membercharSimbadNameSimbad column added by the CDSmeta.idcharf_Li?[<1.6] Limit on column "Li?"meta.codecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintType"Candidate YSOs" or "Photometric standards" typesrc.classcharechSimbad column added by the CDSmeta.ref.urlintnullabler_NameReference for Name (G1)meta.ref;pos.framecharNameStellar identifiermeta.id;meta.maincharr_ONameReference for OName (G1)meta.ref;pos.framecharONameOther stellar namemeta.idcharObsObservational year and telescope used (1)meta.code;obscharo_ObsNumber and region of observation code (4)meta.id;meta.number;obs.fieldcharRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainSpRSpectral type rangesrc.spTypecharSpTAdopted spectral typesrc.spTypecharf_SpT[g] Indicates a spectral type from Winston et al. (2009AJ....137.4777W) or Oliveira et al. 2009 (J/ApJ/691/672)meta.code;src.spTypecharLi?Is LiI emission present? (yes/no/poss=possibly)meta.notecharl_EWHa[<] Upper limit flag on EWHameta.code.errorcharEWHa[-110/14]? H{alpha} equivalent width (in {AA})0.1nmspect.line.eqWidth;em.line.HalphafloatnullableEWmax[-56/-1.2]? Maximum value of equivalent width (2)0.1nmspect.line.eqWidth;em.line.Halpha;stat.maxfloatnullableVmag[8.43/20.72]? The V band magnitudemagphot.mag;em.opt.Vfloatnullablef_Vmag[hf] V not observed, or blend (3)meta.code;phot.mag;em.opt.VcharB-V? The (B-V) color indexmagphot.color;em.opt.B;em.opt.VfloatnullableV-R? The (V-R) color indexmagphot.color;em.opt.V;em.opt.Rfloatnullablef_V-R[h] (V-R) not observed (3)meta.code;phot.color;em.opt.VcharJ/AJ/149/103/table3Optical properties of candidate Young Stellar Objects (YSOs) with echelle spectraMmSimbad column added by the CDSmeta.code.membercharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintr_NameReference for Name (G1)meta.ref;pos.framecharNameObject name (1)meta.id;meta.maincharr_ONameReference for OName (G1)meta.ref;pos.framecharONameOther namemeta.idcharRAJ2000? Hour of Right Ascension (J2000)pos.eq.ra;meta.mainnullableDEJ2000? Degree of Declination (J2000)pos.eq.dec;meta.mainnullableDateDate of observationtime.epochnullableSpRSpectral type rangesrc.spTypecharSpTSpectral type (2)src.spTypecharLCLuminosity class (range of surface gravity)src.class.luminositycharvsini0[14/140]? Rotational velocity (or starting rotational velocity range for SCB 40 and SCB 70) (3)km/sphys.veloc.rotatintnullablee_vsini0? Standard deviation of the mean in vsini0km/sstat.errorintnullablevsini1[24/25]? Ending rotational velocity range for SCB 40 and SCB 70 (3)km/sphys.veloc.rotatintnullablee_vsini1? Standard deviation of the mean in vsini1km/sstat.errorintnullablef_YSOIndicates that H{alpha} emission is variable and not detected in the echelle spectrummeta.codecharYSOYSO criterion (G2)meta.notecharAllSimbad column added by the CDSmeta.ref.urlcharJ/AJ/149/103/table4Association membersNameObject namemeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintechSimbad column added by the CDSmeta.ref.urlintnullabler_NameReference for Name (G1)meta.ref;pos.framecharr_ONameReference for OName (G1)meta.ref;pos.framecharONameOther namemeta.idcharRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainSpTSpectral typesrc.spTypecharf_SpT[d] Indicates a spectral type from Winston et al. (2009AJ....137.4777W) and Oliveira et al. 2009 (cat. J/ApJ/691/672)meta.codecharl_Av[>] Lower limit flag on Avmeta.code.errorcharAv[0/22]? Extinctionmagphys.absorptionfloatnullablef_Av[e] Indicates that 2MASS (J-H) photometry is used to compute Av and JMagmeta.codecharl_VMag[<] Upper limit flag on VMagmeta.code.errorcharVMag[-1.21/12]? Absolute V-band magnitudephys.magAbs;em.opt.Vfloatnullablef_VMag[e] JMag recorded (situation where J and H were used to deredden in Table 2)meta.codecharl_logL[>] Lower limit flag on logLmeta.code.errorcharlogL[-1.7/3]? Log of the bolometric luminositylog(solLum)phys.luminosityfloatnullablee_logL? 1{sigma} uncertainty on logLlog(solLum)stat.errorfloatnullablel_logT[>] Lower limit flag on logTmeta.code.errorcharlogT[3.48/4.18]? Log of the effective temperaturelog(K)phys.temperature.effectivefloatnullableE_logT? Upper 1{sigma} error in logTlog(K)stat.error;stat.maxfloatnullablee_logT? Lower 1{sigma} error in logTlog(K)stat.errorfloatnullableMass[0.14/5.1]? Mass (1)solMassphys.massfloatnullablel_logA[<] Upper limit flag on logAmeta.code.errorcharlogA[5/8]? Log of the age (1)log(yr)time.agefloatnullableMmAssociation membership criterion (G2)meta.notecharAllSimbad column added by the CDSmeta.ref.urlcharJ/AJ/149/103/table5Weak criteria sourcesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintName? Object name from infrared ISO survey by Kaas et al. 2004 (cat. J/A+A/421/623)meta.id;meta.maincharRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainSpTSpectral typesrc.spTypecharAv[3.8/7.9] Extinctionmagphys.absorptionfloatVMag[1.37/6.79] Absolute V-band magnitudemagphot.mag;em.opt.VfloatlogL[-0.56/1.36] Log of the bolometric luminositylog(solLum)phys.luminosityfloate_logL1{sigma} uncertainty in logLlog(solLum)stat.errorfloatlogT[3.62/3.86] Log of the effective temperaturelog(K)phys.temperature.effectivefloatE_logTUpper 1{sigma} error in logTlog(K)stat.error;stat.maxfloate_logTLower 1{sigma} error in logTlog(K)stat.errorfloatMass[0.6/2.3] Mass (1)solMassphys.massfloatlogA[5.61/7.3] Log of the age (1)log(yr)time.agefloatWeakWeak criteria source (2)meta.notecharoptSimbad column added by the CDSmeta.ref.urlchar