J/ApJ/726/19ivo://CDS.VizieR/J/ApJ/726/19doi:10.26093/cds/vizier.17260019CDSWolff S.C.Strom S.E.Rebull L.M.2017-12-05T05:10:21Z2012-09-10T12:24:18ZCDS support team

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

cds-question@unistra.fropen-star-clustersstellar-spectral-typesline-intensitiesinfrared-photometryvisible-astronomybroad-band-photometryinterstellar-reddeningyoung-stellar-objectsWe report the results of a study of the intermediate- and high-mass stars in the young, rich star-forming complex IC 1805, based on a combination of optical, near-infrared, and mid-infrared photometry, and classification spectra. These data provide the basis for characterizing the masses and ages for stars more massive than ~2M_{sun}_ and enable a study of the frequency and character of circumstellar disks associated with intermediate- and high-mass stars. Optically thick accretion disks among stars with masses 2<M/M_{sun}_<4 are rare (~2% of members) and absent among more massive stars. A larger fraction (~10%) of stars with masses 2<M/M_{sun}_<4 appear to be surrounded by disks that have evolved from the initial optically thick accretion phase. We identify four classes of such disks. These classes are based on spectral energy distributions (SEDs) of excess emission above photospheric levels: disks that are (1) optically thin based on the magnitude of the observed excess emission from 2 to 24um, (2) optically thin in their inner regions (r<20AU) and optically thick in their outer regions, (3) exhibit empty inner regions (r<10AU) and optically thin emission in their outer regions, and (4) exhibit empty inner regions and optically thick outer regions. We discuss, and assess the merits and liabilities of, proposed explanations for disks exhibiting these SED types and suggest additional observations that would test these proposals.2011ApJ...726...19Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/726/19CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)V/96 : Catalogue of open cluster parameters from UBV-data. (Loktin+, 1994)J/ApJ/726/18 : Disk evolution in W5: stars at 2-5Myr (Koenig+, 2011)J/AJ/140/462 : Intermediate-mass star-forming regions (Arvidsson+, 2010)J/MNRAS/407/2109 : Kinematic study of open clusters (Vande Putte+, 2010)J/ApJS/184/172 : High- and intermediate-mass YSOs in the LMC (Gruendl+, 2009)J/ApJS/179/451 : IR excesses for protoplanetary disks (Kenyon+, 2008)J/AJ/133/1092 : vsini of B0-B3 stars in 7 young clusters (Wolff+, 2007)J/MNRAS/382/1073 : M/L relation of intermediate-mass stars (Malkov+, 2007)J/A+A/464/581 : Sco OB2 intermediate-mass stars (Kouwenhoven+, 2007)J/ApJ/653/675 : Spitzer 24{mu}m photometry of A dwarfs (Su+, 2006)J/ApJ/648/591 : Stellar rotation in young clusters. II. (Huang+, 2006)J/A+A/432/861 : Yields of low and intermediate mass stars (Gavilan+, 2005)J/ApJ/454/151 : OB Associations of the Northern Milky Way (Massey+ 1995)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/726/19https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/726/19http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/726/19https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/726/19https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/726/19http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/726/19GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/726/19/table1 (Spitzer measurements for sample of previously identified IC 1805 members)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/726/19/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/726/19/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/726/19/table1?GETtext/xml+votable180.050000true38.6209580661.421306110.0055555555555555566/3305 3307 3308 3310 36496.772611666688002e-21 6.118840631666147e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/726/19?format=asciiOpticalInfrareddefaultJ/ApJ/726/19/table1Spitzer measurements for sample of previously identified IC 1805 members[MJD95]Simbad column added by the CDSmeta.id;meta.mainchare_Jmag? Uncertainty in Jmagmagstat.error;phot.mag;em.IR.Jfloatnullable[4.5]? Spitzer/IRAC 4.5 micron band magnitudemagphot.mag;em.IR.4-8umfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSSimbad column added by the CDSmeta.ref.urlcharSeqOptical index number from Massey et al. (1995, Cat. J/ApJ/454/151; "recno" in VizieR; <[MJD95] JHHMMSS.ss+DDMMSS.s> in Simbad)meta.idintprimaryRAJ2000Right Ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.main2MASS2MASS name (HHMMSSss+DDMMSSs; J2000)meta.id.crosscharSEDSED plot of this starmeta.ref.urlcharUmagThe U band magnitude from MJD95magphot.mag;em.opt.UfloatBmagThe B band magnitude from MJD95magphot.mag;em.opt.BfloatVmagThe V band magnitude from MJD95magphot.mag;em.opt.VfloatJmag? 2MASS J band magnitudemagphot.mag;em.IR.JfloatnullableHmag? 2MASS H band magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag? Uncertainty in Hmagmagstat.error;phot.mag;em.IR.HfloatnullableKsmag? 2MASS Ks band magnitudemagphot.mag;em.IR.Kfloatnullablee_Ksmag? Uncertainty in Ksmagmagstat.error;phot.mag;em.IR.Kfloatnullablel_[3.6]Limit flag on [3.6]meta.code.errorchar[3.6]? Spitzer/IRAC 3.6 micron band magnitudemagphot.mag;em.IR.3-4umfloatnullablee_[3.6]? Uncertainty in [3.6]magstat.errorfloatnullablel_[4.5]Limit flag on [4.5]meta.code.errorchare_[4.5]? Uncertainty in [4.5]magstat.errorfloatnullable[5.8]? Spitzer/IRAC 5.8 micron band magnitudemagphot.flux.density;em.IR.4-8umfloatnullablee_[5.8]? Uncertainty in [5.8]magstat.errorfloatnullable[8.0]? Spitzer/IRAC 8 micron band magnitudemagphot.flux.density;em.IR.8-15umfloatnullablee_[8.0]? Uncertainty in [8.0]magstat.errorfloatnullablel_[24]Limit flag on [24]meta.code.errorchar[24]? Spitzer/MIPS 24 micron band magnitudemagphot.flux.density;em.IR.15-30umfloatnullablee_[24]? Uncertainty in [24]magstat.errorfloatnullableJ/ApJ/726/19/table3Spectral types and likely members of IC 1805recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqOptical index number from Massey et al. (1995, Cat. J/ApJ/454/151)meta.id;meta.mainintf_Seq[*] IR excess in Seqmeta.codecharSpTMK spectral type from this papersrc.spTypecharEW? Equivalent width 4430{AA} interstellar feature0.1nmspect.line.eqWidthfloatnullablef_EWUncertainty flag on EQWmeta.codecharE(B-V)Q? E(B-V) from Q method (for stars with Q=(U-B)-0.72x(B-V)<-0.4, following Massey et al., 1995ApJ...438..188M)magphot.color.excessfloatnullableE(B-V)S? E(B-V) from spectral typemagphot.color.excessfloatnullableE(B-V)Adopted E(B-V)magphot.color.excessfloatBmag0Dereddened B band magnitudemagphot.mag;em.opt.BfloatVmag0Dereddened V band magnitudemagphot.mag;em.opt.Vfloat(B-V)0Dereddened (B-V) color indexmagphot.color;em.opt.B;em.opt.Vfloat