J/ApJ/762/128ivo://CDS.VizieR/J/ApJ/762/128doi:10.26093/cds/vizier.17620128CDSOliveira I.Merin B.Pontoppidan K.M.van Dishoeck E.F.2018-01-04T08:21:35Z2014-10-17T12:31:30ZCDS support team

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

cds-question@unistra.frmolecular-cloudsinfrared-astronomyspectroscopyyoung-stellar-objectsstellar-spectral-typesstellar-massesstellar-ageseffective-temperatureSpectral energy distributions are presented for 94 young stars surrounded by disks in the Serpens Molecular Cloud, based on photometry and Spitzer/IRS spectra. Most of the stars have spectroscopically determined spectral types. Taking a distance to the cloud of 415pc rather than 259pc, the distribution of ages is shifted to lower values, in the 1-3Myr range, with a tail up to 10Myr. The mass distribution spans 0.2-1.2M_{sun}_, with median mass of 0.7M_{sun}_. The distribution of fractional disk luminosities in Serpens resembles that of the young Taurus Molecular Cloud, with most disks consistent with optically thick, passively irradiated disks in a variety of disk geometries (L_disk_/L_star_~0.1). In contrast, the distributions for the older Upper Scorpius and {eta} Chamaeleontis clusters are dominated by optically thin lower luminosity disks (L_disk_/L_star_~0.02). This evolution in fractional disk luminosities is concurrent with that of disk fractions: with time disks become fainter and the disk fractions decrease. The actively accreting and non-accreting stars (based on H{alpha} data) in Serpens show very similar distributions in fractional disk luminosities, differing only in the brighter tail dominated by strongly accreting stars. In contrast with a sample of Herbig Ae/Be stars, the T Tauri stars in Serpens do not have a clear separation in fractional disk luminosities for different disk geometries: both flared and flat disks present wider, overlapping distributions. This result is consistent with previous suggestions of a faster evolution for disks around Herbig Ae/Be stars. Furthermore, the results for the mineralogy of the dust in the disk surface (grain sizes, temperatures and crystallinity fractions, as derived from Spitzer/IRS spectra) do not show any correlation to either stellar and disk characteristics or mean cluster age in the 1-10Myr range probed here. A possible explanation for the lack of correlation is that the processes affecting the dust within disks have short timescales, happening repeatedly, making it difficult to distinguish long-lasting evolutionary effects.2013ApJ...762..128Ohttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/762/128CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/MNRAS/421/3257 : MHO catalogue for Serpens and Aquila (Ioannidis+, 2012)J/ApJ/734/51 : Mineralogical compositions of dust grains (Oliveira+, 2011)J/ApJ/724/835 : The Spitzer c2d survey of WTTSs. III. (Wahhaj+, 2010)J/ApJ/714/778 : YSOs in the Serpens Molecular Cloud (Oliveira+, 2010)J/A+A/513/A38 : RZJHK phot. for stellar sources in Serpens (Spezzi+, 2010)J/AJ/140/266 : NGC 1333 X-ray luminous YSOs properties (Winston+, 2010)J/ApJS/184/18 : Spitzer survey of young stellar clusters (Gutermuth+, 2009)J/ApJS/181/321 : Properties of Spitzer c2d dark clouds (Evans+, 2009)J/ApJ/692/973 : Protostars in Perseus, Serpens and Ophiuchus (Enoch+, 2009)J/ApJ/691/672 : YSOs spectroscopy in Serpens molecular cloud (Oliveira+ 2009)J/ApJ/669/493 : Spitzer/Chandra YSOs in Serpens cloud core (Winston+, 2007)J/ApJ/667/308 : Weak-line T Tauri in Spitzer c2d Survey. II. (Cieza+, 2007)J/ApJ/663/1149 : Spitzer survey of Serpens YSO population (Harvey+, 2007)J/A+A/421/623 : ISOCAM survey of YSOs in Serpens Cloud Core (Kaas+, 2004)J/A+A/337/403 : Low-mass stars evolutionary models (Baraffe+ 1998)J/A+A/330/990 : VRIJHK phot. of the Serpens cloud core (Giovannetti+ 1998)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/762/128https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/762/128http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/762/128https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/762/128https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/762/128http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/762/128GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/762/128/table1 (Stellar and disk parameters in Serpens)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/762/128/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/762/128/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/762/128/table1?GETtext/xml+votable180.050000true276.9742917-0.04263890.0055555555555555565/7590 6/30366https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/762/128?format=asciiOpticalInfrareddefaultJ/ApJ/762/128/table1Stellar and disk parameters in SerpensAv[0/25] Visual extinctionmagphys.absorption;em.opt.VfloatAge[0.3/22]? AgeMyrtime.agefloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[OMP2009][1/149] Identification number as in Oliveira et al. (2010, Cat. J/ApJ/714/778)meta.recordintSSTc2dSSTc2d identifier (HHMMSSss+DDMMSSs; J2000)meta.idcharf_SpT[b] b: spectral types from photometrymeta.codecharSpTMK spectral typesrc.spTypecharTeff[2510/8970] Effective temperatureKphys.temperature.effectiveintE_Teff[50/3100] Positive error on TeffKstat.error;stat.maxinte_Teff[30/1220] Negative error on TeffKstat.error;phys.temperature.effectiveintLstar[0.02/371] Stellar luminositysolLumphys.luminosity;em.IRfloatE_Lstar[0.02/289] Positive error on LstarsolLumstat.error;stat.maxfloate_Lstar[0.01/87] Negative error on LstarsolLumstat.errorfloatLdisk[0/90] Disk luminositysolLumphys.luminosityfloatE_Ldisk[0/63] Positive error on LdisksolLumstat.error;stat.maxfloate_Ldisk[0/63] Negative error on LdisksolLumstat.errorfloatE_Age[0.06/71]? Positive error on AgeMyrstat.error;stat.maxfloatnullablee_Age[0.06/16]? Negative error on AgeMyrstat.error;time.agefloatnullableMass[0.06/117]? MasssolMassphys.massfloatnullableE_Mass[0.02/2]? Positive error on MasssolMassstat.error;stat.maxfloatnullablee_Mass[0/1.1]? Negative error on MasssolMassstat.error;phys.massfloatnullableAccr[yes/no /-] Accreting?meta.codecharSimbadSimbad column added by the CDSmeta.ref.urlchar_RAPositions from SSTc2d name (right ascension part)degpos.eq.ra;meta.main_DEPositions from SSTc2d name (declination part)degpos.eq.dec;meta.main