J/ApJ/755/154ivo://CDS.VizieR/J/ApJ/755/154doi:10.26093/cds/vizier.17550154CDSManara C.F.Robberto M.Da Rio N.Lodato G.Hillenbrand L.A.,Stassun K.G.Soderblom D.R.2017-06-12T08:25:05Z2014-04-09T12:25:50ZCDS support team

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

cds-question@unistra.fraccretionopen-star-clustershst-photometryline-intensitiesstellar-massesstellar-agesThe present observational understanding of the evolution of the mass accretion rates (dM/dt_acc_) in pre-main-sequence stars is limited by the lack of accurate measurements of dM/dt_acc_ over homogeneous and large statistical samples of young stars. Such observational effort is needed to properly constrain the theory of star formation and disk evolution. Based on Hubble Space Telescope/WFPC2 observations, we present a study of dM/dt_acc_ for a sample of ~700 sources in the Orion Nebula Cluster, ranging from the hydrogen-burning limit to M*~2M_{sun}_. We derive dM/dt_acc_ from both the U-band excess and the H{alpha} luminosity (L_H{alpha}_), after determining empirically both the shape of the typical accretion spectrum across the Balmer jump and the relation between the accretion luminosity (L_acc_) and L_H{alpha}_, which is L_acc_/L_{sun}_=(1.31+/-0.03).L_H{alpha}/L_{sun}_+(2.63+/-0.13). Given our large statistical sample, we are able to accurately investigate relations between dM/dt_acc_ and the parameters of the central star such as mass and age.2012ApJ...755..154Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/755/154CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/hst : HST Archived Exposures Catalog (STScI, 2007)J/ApJS/208/28 : H{alpha} survey in the ONC (Szegedi-Elek+, 2013)J/ApJS/207/10 : HST Treasury Program on the ONC (Robberto+, 2013)J/ApJ/748/14 : ONC population data from WFI observations (Da Rio+, 2012)J/ApJ/722/1092 : Optical photometry of the ONC. II. (Da Rio+, 2010)J/A+A/534/A10 : HST/NICMOS III imaging in ONC (Andersen+, 2011)J/AJ/136/2136 : HST/ACS Atlas of Great Orion Nebula proplyds (Ricci+, 2008)J/MNRAS/374/1413 : SCUBA survey of Orion (Nutter+, 2007)J/ApJ/642/1140 : Disk mass loss in the Orion Nebula Cluster (Olczak+, 2006)J/AJ/129/363 : Spectroscopy in Orion Nebula Cluster (Sicilia-Aguilar+, 2005)J/AJ/111/846 : Orion HST survey (O'Dell+ 1996)http://archive.stsci.edu/prepds/orion/ : HST Treasury Program on the ONChttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/755/154https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/755/154http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/755/154https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/755/154https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/755/154http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/755/154GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/755/154/2cd (Stellar parameters and accretion values of the sources with A_V_ and L_acc_ determined from the 2CD method)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/755/154/2cd?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/755/154/2cd?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/755/154/2cd?GETtext/xml+votable180.050000true83.5628625-5.3833252780.005555555555555556Cone search capability for table J/ApJ/755/154/dario (Stellar parameters and accretion values of the sources with A_V_ from Da Rio+ (Cat. J/ApJ/748/14) and L_acc_ determined from the H{alpha} luminosity)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/755/154/dario?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/755/154/dario?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/755/154/dario?GETtext/xml+votable180.050000true83.639870833-5.3691110.0055555555555555566/21438 21439 22804 22805https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/755/154?format=asciidefaultJ/ApJ/755/154/2cdStellar parameters and accretion values of the sources with A_V_ and L_acc_ determined from the 2CD methodf_M3[N] N=NaNmeta.codecharDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainlogA3? Log of the age (4)log(yr)time.agefloatnullableTeff[2906/5943] Effective temperature (G2)Kphys.temperature.effectiveintrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintOMOrion Master Catalog entry number (G1)meta.id;meta.mainintRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainAv[-0.2/4.5] Extinction in the V bandmagphys.absorption;em.opt.VfloatlogL[-2.1/1] Log of the luminositylog(solLum)phys.luminosityfloatRad[0.3/4.2] Star radiussolRadphys.size.radiusfloatIacc[-2.2/0] I band excess due to accretionmagphot.color.excessfloatCL[1/3] Confidence level (in {sigma})stat.fit.goodnessintR13Cross-match within 1" with Robberto+, 2013, Cat. J/ApJS/207/10 (WFPC2)meta.ref.urlintnullableDRCross-match within 2" with Da Rio+, 2012, Cat. J/ApJ/748/14meta.ref.urlintnullablelogLacc[-5.5/0.9]? Log of the accretion luminositylog(solLum)phys.luminosityfloatnullablef_logLacc[I] I=-{infty} (Lacc=0)meta.codecharM1[0.04/2.5] Mass (2)solMassphys.massfloatlogA1[4.4/8] Log of the age (2)log(yr)time.agefloatlogMd1[-12.2/-6]? Log of mass accretion rate (2)log(solMass.yr**-1)phys.mass.lossfloatnullablef_logMd1[NI] N=NaN, I=-{infty} (Md1=0)meta.codecharM2? Mass (3)solMassphys.massfloatnullablef_M2[N] N=NaNmeta.codecharlogA2? Log of the age (3)log(yr)time.agefloatnullablelogMd2? Log of mass accretion rate (3)log(solMass.yr**-1)phys.mass.lossfloatnullablef_logMd2[NI] N=NaN, I=-{infty} (Md2=0)meta.codecharM3? Mass (4)solMassphys.massfloatnullablelogMd3? Log of mass accretion rate (4)log(solMass.yr**-1)phys.mass.lossfloatnullablef_logMd3[NI] N=NaN, I=-{infty} (Md3=0)meta.codecharJ/ApJ/755/154/darioStellar parameters and accretion values of the sources with A_V_ from Da Rio+ (Cat. J/ApJ/748/14) and L_acc_ determined from the H{alpha} luminosityrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintOMOrion Master Catalog entry number (G1)meta.id;meta.mainintRAJ2000Hour of Right Ascension (J2000)pos.eq.ra;meta.mainDEJ2000Degree of Declination (J2000)pos.eq.dec;meta.mainTeff[2778/9309] Effective temperature (G2)Kphys.temperature.effectiveintAv[-2/11] Extinction in the V band (G2)magphys.absorption;em.opt.VfloatlogL[-2.3/1.7] Log of the luminositylog(solLum)phys.luminosityfloatRad[0.3/4.4] Star radiussolRadphys.size.radiusfloatEW[3/983] Equivalent width of H{alpha} ({AA})0.1nmspect.line.eqWidth;em.line.HalphafloatlogLHa[-6.2/-1.3] Log of the H{alpha} luminositylog(solLum)phys.luminosity;em.line.HalphafloatR13Cross-match within 1" with Robberto+, 2013, Cat. J/ApJS/207/10 (WFPC2)meta.ref.urlintnullableDRCross-match within 2" with Da Rio+, 2012, Cat. J/ApJ/748/14meta.ref.urlintnullablelogLacc[-5.5/0.9]? Log of the accretion luminositylog(solLum)phys.luminosityfloatnullablef_logLacc[I] I=-{infty} (Lacc=0)meta.codecharM1[0.04/2.5] Mass (2)solMassphys.massfloatlogA1[4.4/8] Log of the age (2)log(yr)time.agefloatlogMd1[-12.2/-6]? Log of mass accretion rate (2)log(solMass.yr**-1)phys.mass.lossfloatnullablef_logMd1[NI] N=NaN, I=-{infty} (Md1=0)meta.codecharM2? Mass (3)solMassphys.massfloatnullablef_M2[N] N=NaNmeta.codecharlogA2? Log of the age (3)log(yr)time.agefloatnullablelogMd2? Log of mass accretion rate (3)log(solMass.yr**-1)phys.mass.lossfloatnullablef_logMd2[NI] N=NaN, I=-{infty} (Md2=0)meta.codecharM3? Mass (4)solMassphys.massfloatnullablef_M3[N] N=NaNmeta.codecharlogA3? Log of the age (4)log(yr)time.agefloatnullablelogMd3? Log of mass accretion rate (4)log(solMass.yr**-1)phys.mass.lossfloatnullablef_logMd3[NI] N=NaN, I=-{infty} (Md3=0)meta.codechar