J/ApJ/710/597ivo://CDS.VizieR/J/ApJ/710/597doi:10.26093/cds/vizier.17100597CDSSicilia-Aguilar A.Henning T.Hartmann L.W.2017-06-21T08:22:45Z2012-04-11T12:48:17ZCDS support team

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

cds-question@unistra.frinfrared-photometryvisible-astronomyWide-band photometrystellar-mass-losspre-main-sequence-starsyoung-stellar-objectsopen-star-clustersWe present accretion rates for a large number of solar-type stars in the Cep OB2 region, based on U-band observations. Our study comprises 95 members of the ~4Myr old cluster Tr 37 (including 20 "transition" objects (TOs)), as well as the only classical T Tauri star (CTTS) in the ~12Myr old cluster NGC 7160. The stars show different disk morphologies, with the majority of them having evolved and flattened disks. The typical accretion rates are about 1 order of magnitude lower than in regions aged 1-2Myr, and we find no strong correlation between disk morphology and accretion rates. Although half of the TOs are not accreting, the median accretion rates of normal CTTS and accreting "transition" disks are similar (~3x10^-9^ and 2x10^-9^M_{sun}_/yr, respectively). Comparison with other regions suggests that the TOs observed at different ages do not necessarily represent the same type of objects, which is consistent with the fact that the different processes that can lead to reduced IR excess/inner disk clearing (e.g., binarity, dust coagulation/settling, photoevaporation, giant planet formation) do not operate on the same timescales.2010ApJ...710..597Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/710/597CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/AJ/132/2135 : High-resolution spectroscopy in Tr 37 (Sicilia-Aguilar+, 2006)J/ApJ/638/897 : IR photometry in Trumpler 37 and NGC 7160 (Sicilia-Aguilar+,J/AJ/130/188 : Young stars in Trumpler 37 and NGC 7160 (Sicilia-Aguilar+,J/AJ/128/805 : Low-mass stars in the Cepheus OB2 region (Sicilia-Aguilar+https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/710/597https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/710/597http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/710/597https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/710/597https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/710/597http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/710/597GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/710/597/CepOB2 (Accretion and stellar properties of solar-type stars in Cep OB2)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/710/597/CepOB2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/710/597/CepOB2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/710/597/CepOB2?GETtext/xml+votable180.050000true323.811708357.35644440.0055555555555555566/15476 15478 15479 15484 156621.9821045660507152e-19 6.118840631666147e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/710/597?format=asciiOpticalInfrareddefaultJ/ApJ/710/597/CepOB2Accretion and stellar properties of solar-type stars in Cep OB2SimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintClusterTarget name (Tr 37 or NGC 7160)meta.id.parentchar[SHB2004]Source name (G1)meta.id;meta.mainchar2MASS2MASS designation (HHMMSSss+DDMMSSs; J2000)meta.idcharSpTMK spectral typesrc.spTypecharPtgPointing (1)meta.id;obscharUmagU-band magnitudemagphot.mag;em.opt.Ufloate_UmagUmag uncertaintymagstat.error;phot.mag;em.opt.Ufloatf_Umag[b] Probably non-member (2)meta.codecharVmag? V-band magnitudemagphot.mag;em.opt.Vfloatnullablee_Vmag? Vmag uncertaintymagstat.error;phot.mag;em.opt.VfloatnullableRmag? Johnson R-band magnitudemagphot.mag;em.opt.Rfloatnullablee_Rmag? Rmag uncertaintymagstat.error;phot.mag;em.opt.RfloatnullableImag? Johnson I-band magnitudemagphot.mag;em.opt.Ifloatnullablee_Imag? Imag uncertaintymagstat.error;phot.mag;em.opt.IfloatnullableAVV-band extinctionmagphys.absorption;em.opt.Vfloate_AVAV uncertaintymagstat.errorfloatf_AV[c] Anomalous extinction (2)meta.codecharNotesNotes (3)meta.notecharf_Notes[ab] excluded objects (2)meta.notecharW(Ha)1? High-resolution equivalent width of H{alpha} (4)0.1nmspect.line.eqWidthintnullableW(Ha)2? High-resolution EW of H{alpha} (4)0.1nmspect.line.eqWidthintnullableW(Ha)3? Low-resolution equivalent width of H{alpha} (4)0.1nmspect.line.eqWidthfloatnullableW(Ha)4? Low-resolution EW of H{alpha} (4)0.1nmspect.line.eqWidthintnullableHa[BPN: ] H{alpha} profile (5)src.classcharDiskDisk type (6)src.classcharLumPhotospheric luminosity in U-band (7)solLumphys.luminosityfloatRadStellar radius (8)solRadphys.size.radiusfloatAgeAge (8)Myrtime.agefloatMassStellar mass (8)solMassphys.massfloatdMU/dtThe accretion directly measured from the U-band photometry (dM_U_/dt) (7)1e-08solMass.yr**-1phys.mass.lossfloatE_dMU/dtPositive error on dMU/dt1e-08solMass.yr**-1stat.error;stat.maxfloate_dMU/dtNegative error on dMU/dt1e-08solMass.yr**-1stat.errorfloatl_dM/dtLimit flag on dM/dtmeta.code.errorchardM/dtThe final value of the accretion rate (9)1e-08solMass.yr**-1phys.mass.lossfloatl_dM/dt2Limit flag on dM/dt2meta.code.errorchardM/dt2? Second final value of the accretion rate (9)1e-08solMass.yr**-1phys.mass.lossfloatnullableCommComments (8)meta.notecharSADisplay the data from previous Sicilia-Aguilar et al. catalogs within 1.5"meta.ref.urlintnullable_RAPositions from 2MASS name (right ascension part)degpos.eq.ra;meta.main_DEPositions from 2MASS name (declination part)degpos.eq.dec;meta.main