J/ApJ/714/778ivo://CDS.VizieR/J/ApJ/714/778doi:10.26093/cds/vizier.17140778CDSOliveira I.Pontoppidan K.M.Merin B.van Dishoeck E.F.Lahuis F.,Geers V.C.Jorgensen J.K.Olofsson J.Augereau J.-C.Brown J.M.2017-11-10T11:15:38Z2012-05-21T11:39:28ZCDS support team

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

cds-question@unistra.frmolecular-cloudsinfrared-astronomyspectroscopyyoung-stellar-objectsstellar-spectral-typesastronomical-object-identificationWe present Spitzer InfraRed Spectrograph (IRS) mid-infrared (5-35um) spectra of a complete flux-limited sample (>=3mJy at 8um) of young stellar object (YSO) candidates selected on the basis of their infrared colors in the Serpens Molecular Cloud. Spectra of 147 sources are presented and classified. Background stars (with slope consistent with a reddened stellar spectrum and silicate features in absorption), galaxies (with redshifted polycyclic aromatic hydrocarbon (PAH) features), and a planetary nebula (with high ionization lines) amount to 22% of contamination in this sample, leaving 115 true YSOs. Sources with rising spectra and ice absorption features, classified as embedded Stage I protostars, amount to 18% of the sample. The remaining 82% (94) of the disk sources are analyzed in terms of spectral energy distribution shapes, PAHs, and silicate features. The presence, strength, and shape of these silicate features are used to infer disk properties for these systems. About 8% of the disks have 30/13um flux ratios consistent with cold disks with inner holes or gaps, and 3% of the disks show PAH emission.2010ApJ...714..778Ohttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/714/778CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/692/973 : Protostars in Perseus, Serpens and Ophiuchus (Enoch+, 2009)J/ApJ/691/672 : Spectrocopy of YSOs in Serpens molecular cloud (Oliveira+J/ApJ/663/1149 : Spitzer survey of Serpens YSO population (Harvey+, 2007)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/458/789 : ISOCAM survey of Serpens/G3-G6 (Djupvik+, 2006)J/A+A/421/623 : ISOCAM survey of YSOs in Serpens Cloud Core (Kaas+, 2004)http://irsa.ipac.caltech.edu/data/SPITZER/docs/spitzermission/observingprograms/legacy/c2d/ : Spitzer c2d data deliveries pagehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/714/778https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/714/778http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/714/778https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/714/778https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/714/778http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/714/778GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/714/778/table1 (Observed objects in Serpens)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/714/778/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/714/778/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/714/778/table1?GETtext/xml+votable180.050000true276.9742917-0.04263890.0055555555555555565/7590 6/303668.346395883431657e-21 2.0269875424394095e-20https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/714/778?format=asciiOpticalInfrareddefaultJ/ApJ/714/778/table1Observed objects in SerpensAORAOR numbermeta.id;obsintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[OMP2009]Number as in Oliveira et al. (2009, Cat. J/ApJ/691/672)meta.recordintprimaryYSimbad column added by the CDSmeta.ref.urlchar[HMH2007]? Identification number from Harvey et al. (2007, Cat. J/ApJ/663/1149)meta.id.crossintnullableSSTc2d(HHMMSSss+DDMMSSs; J2000; <SSTc2d JHHMMSS.s+DDMMSS> in Simbad)meta.id.crosscharalpha2um-24um spectral slope (1)spect.indexfloatF30/F13? Flux ratio between 30 and 13umphot.flux;arith.ratiofloatnullableClassClassification (BG star, Cold disk, Disk, Emb, Galaxy or PN candidate)src.classcharO09YSO candidates (within 1.5") reported by Oliveira et al., 2009, Cat. J/ApJ/691/672meta.ref.urlintnullableSimbadSimbad column added by the CDSmeta.refchar_RAPositions from SSTc2d name (right ascension part)degpos.eq.ra;meta.main_DEPositions from SSTc2d name (declination part)degpos.eq.dec;meta.mainProg[GO3/c2d] Program identification (2)meta.id;obscharDateDate of observationtime.epochnullableJ/ApJ/714/778/table2Characteristics of YSOs in SerpensPAH[Y/ ] PAH emission? (3)meta.codecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[OMP2009]Number as in Oliveira et al. (2009, Cat. J/ApJ/691/672)meta.recordintEmb[Y/ ] Embedded?meta.codecharS9.8? 9.8um peak fluxmJyphot.fluxfloatnullableS11.3? 11.3um peak fluxmJyphot.fluxfloatnullableS10? 10um peak fluxmJyphot.fluxfloatnullableS19? 19.0um peak fluxmJyphot.fluxfloatnullableS23.8? 23.8um peak fluxmJyphot.fluxfloatnullableS20? 20um peak fluxmJyphot.fluxfloatnullableCl[A-E]? Cluster membership (4)meta.codecharSpTMK spectral typesrc.spTypechar