J/ApJ/832/87ivo://CDS.VizieR/J/ApJ/832/87doi:10.26093/cds/vizier.18320087CDSBalog Z.Siegler N.Rieke G.H.Kiss L.L.Muzerolle J.Gutermuth R.A.,Bell C.P.M.Vinko J.Su K.Y.L.Young E.T.Gaspar A.2018-12-03T12:04:39Z2017-03-27T13:54:01ZCDS support team

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

cds-question@unistra.fropen-star-clustersyoung-stellar-objectsinfrared-photometryvisible-astronomybroad-band-photometryspectroscopystellar-spectral-typesastronomical-object-identificationWe present new deep UBVRI images and high-resolution multi-object optical spectroscopy of the young (~6-10Myr old), relatively nearby (800pc) open cluster IC 2395. We identify nearly 300 cluster members and use the photometry to estimate their spectral types, which extend from early B to middle M. We also present an infrared imaging survey of the central region using the IRAC and MIPS instruments on board the Spitzer Space Telescope, covering the wavelength range from 3.6 to 24{mu}m. Our infrared observations allow us to detect dust in circumstellar disks originating over a typical range of radii from ~0.1 to ~10 au from the central star. We identify 18 Class II, 8 transitional disk, and 23 debris disk candidates, respectively, 6.5%, 2.9%, and 8.3% of the cluster members with appropriate data. We apply the same criteria for transitional disk identification to 19 other stellar clusters and associations spanning ages from ~1 to ~18Myr. We find that the number of disks in the transitional phase as a fraction of the total with strong 24{mu}m excesses ([8]-[24]>=1.5) increases from (8.4+/-1.3)% at ~3Myr to (46+/-5)% at ~10Myr. Alternative definitions of transitional disks will yield different percentages but should show the same trend.2016ApJ...832...87Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/832/87CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/ocl : Optically visible open clusters and Candidates (Dias+ 2002-2015)B/mk : Catalogue of Stellar Spectral Classifications (Skiff, 2009-2016)III/257 : RAVE second data release (Zwitter+, 2008)I/297 : NOMAD Catalog (Zacharias+ 2005)V/126 : MEGA-H proper motion catalog (Kharchenko, 2004)II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)J/MNRAS/454/593 : Young moving groups in solar neighbourhood (Bell+, 2015)J/MNRAS/442/2543 : Dust disks around star in young clusters (Yasui+, 2014)J/A+A/564/A79 : Proper motions of open clusters from UCAC4 (Dias+, 2014)J/ApJS/208/9 : Intrinsic colors & temperatures of PMS stars (Pecaut+, 2013)J/ApJ/768/25 : Spitzer & Herschel obs. of debris disks (Gaspar+, 2013)J/ApJ/750/98 : 24um obs. of AFGKM stars of 3 clusters (Urban+, 2012)J/A+A/548/A97 : Catalogue of variable stars in open clusters (Zejda+, 2012)J/PAZh/38/763 : XHIP-II: Clusters and associations (Francis+, 2012)J/ApJS/184/18 : Spitzer survey of young stellar clusters (Gutermuth+, 2009)J/ApJ/698/1989 : Spitzer survey of NGC 2451 (Balog+, 2009)J/ApJ/660/1532 : Spitzer/IRAC-MIPS survey of NGC 2244 (Balog+, 2007)J/A+A/446/949 : Open clusters proper motions based on UCAC2 (Dias+, 2006)J/A+A/438/1163 : Catalogue of Open Cluster Data (COCD) (Kharchenko+, 2005)J/ApJS/161/118 : byH{alpha} photometry in open clusters (McSwain+, 2005)J/A+A/409/541 : UBV photometry of IC 2395 (Claria+, 2003)J/A+A/376/441 : Absolute proper motions of 112 open clusters (Dias+, 2001)J/A+AS/146/251 : Open clusters absolute proper motions. I. (Baumgardt+, 2000)J/PAZh/25/10 : Young open clusters space-age distribution (Dambis, 1999)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/832/87https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/832/87http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/832/87https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/832/87https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/832/87http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/832/87GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/832/87/table2 (General characteristics of IC 2395 cluster members from Claria+ 2003, J/A+A/409/541)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/832/87/table2?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/832/87/table2?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/832/87/table2?GETtext/xml+votable180.050000true130.04125-48.1326670.005555555555555556Cone search capability for table J/ApJ/832/87/members (Optical and infrared photometry of cluster members (tables 3 and 4))https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/832/87/members?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/832/87/members?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/832/87/members?GETtext/xml+votable180.050000true130.04111-48.132670.0055555555555555565/94666.772611666688002e-21 6.118840631666147e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/832/87?format=asciiOpticalInfrareddefaultJ/ApJ/832/87/table2General characteristics of IC 2395 cluster members from Claria+ 2003, J/A+A/409/541recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordint[CLP2003][1/268] Identifier (1)meta.id;meta.mainintID[1/288]? ID from table 4 (2)meta.id.crossintnullableRAJ2000[8] 2MASS hour of right ascension (J2000)pos.eq.ra;meta.mainDEJ2000[47/48] 2MASS degree of declination (J2000)pos.eq.dec;meta.mainSpTMK spectral typesrc.spTypecharr_SpT[1/4]? SpT reference (3)meta.ref;pos.frameintnullableVmag[5.4/14.6] V-band magnitude (1)magphot.mag;em.opt.VfloatB-V[-0.2/0.7] B-V color index (1)magphot.color;em.opt.B;em.opt.VfloatpmRA[-13.7/6.6]? Proper motion in RA ({mu}_{alpha}_cos{delta}) (4)mas/yrpos.pm;pos.eq.rafloatnullablee_pmRA[0.6/5.9]? pmRA uncertaintymas/yrstat.error;pos.pm;pos.eq.rafloatnullablepmDE[-1.9/13.3]? Proper motion in DEC ({mu}_{delta}_) (4)mas/yrpos.pm;pos.eq.decfloatnullablee_pmDE[0.4/5.8]? pmDE uncertaintymas/yrstat.error;pos.pm;pos.eq.decfloatnullableONameOther designations (5)meta.idcharf_ONameFlag on OName (6)meta.codecharS14Display data from Skiff, 2009-2016, B/mk, within 2"meta.ref.urlintnullableNOMADDisplay data from NOMAD (Zacharias+, 2005, I/297) within 2"meta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlcharJ/ApJ/832/87/table5Disk candidates in IC 2395recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintID[14/283] Identifier as in tables 3 and 4meta.id;meta.mainintSpT? MK spectral typesrc.spTypechar[3.6]-[5.8]Spitzer/IRAC ([3.6]-[5.8]) color indexmagphot.color;em.IR;em.IRfloate_[3.6]-[5.8]Uncertainty on [3.6]-[5.8]magstat.errorfloat[4.5]-[8]Spitzer/IRAC ([4.5]-[8]) color indexmagphot.color;em.IR;em.IRfloate_[4.5]-[8]Uncertainty on [4.5]-[8]magstat.errorfloat[8]-[24]Spitzer ([8]-[24]) color indexmagphot.color;em.IR;em.IRfloate_[8]-[24]Uncertainty on [8]-[24]magstat.errorfloatType? Disk type (1)src.classcharJ/ApJ/832/87/membersOptical and infrared photometry of cluster members (tables 3 and 4)2MDisplay the 2MASS data (Cutri+ 2003, II/246) within 2"meta.ref.urlcharSimbadSimbad column added by the CDSmeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDRunning index numbermeta.id;meta.mainintprimaryDkmeta.ref.urlcharRAJ2000Right Ascension in decimal degrees (J2000) (1)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000) (1)degpos.eq.dec;meta.mainSpTMK spectral type (2)src.spTypecharUmag[5.9/21.9]? The CTIO Johnson U band magnitudemagphot.mag;em.opt.Ufloatnullablee_Umag[0.002/0.3]? Uncertainty in Umagmagstat.error;phot.mag;em.opt.UfloatnullableBmag[7.6/21.4]? The CTIO Johnson B band magnitudemagphot.mag;em.opt.Bfloatnullablee_Bmag[0.002/0.2]? Uncertainty in Bmagmagstat.error;phot.mag;em.opt.BfloatnullableVmag[7.6/20.8]? The CTIO Johnson V band magnitudemagphot.mag;em.opt.Vfloatnullablee_Vmag[0.003/20.8]? Uncertainty in Vmagmagstat.error;phot.mag;em.opt.VfloatnullableRmag[7.8/19.3]? The CTIO Cousins R band magnitudemagphot.mag;em.opt.Rfloatnullablee_Rmag[0.003/0.2]? Uncertainty in Rmagmagstat.error;phot.mag;em.opt.RfloatnullableImag[6.7/17.5]? The CTIO Cousins I band magnitudemagphot.mag;em.opt.Ifloatnullablee_Imag[0.003/0.2]? Uncertainty in Imagmagstat.error;phot.mag;em.opt.IfloatnullableJmag[5.8/16]? 2MASS J band magnitudemagphot.mag;em.IR.Jfloatnullablee_Jmag[0.01/0.2]? Uncertainty in Jmagmagstat.error;phot.mag;em.IR.JfloatnullableHmag[5.8/15.3]? 2MASS H band magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag[0.02/0.2]? Uncertainty in Hmagmagstat.error;phot.mag;em.IR.HfloatnullableKsmag[5.9/14.8] 2MASS K_S_ band magnitudemagphot.mag;em.IR.Kfloate_Ksmag[0.01/0.2] Uncertainty in Ksmagmagstat.error;phot.mag;em.IR.Kfloat3.6mag[6.1/14.6]? Spitzer/IRAC 3.6um band magnitudemagphot.mag;em.IR.3-4umfloatnullablee_3.6mag[0.002/0.09]? Uncertainty in 3.6magmagstat.errorfloatnullable4.5mag[6.1/14.5]? Spitzer/IRAC 4.5um band magnitudemagphot.mag;em.IR.4-8umfloatnullablee_4.5mag[0.002/0.06]? Uncertainty in 4.5magmagstat.errorfloatnullable5.8mag[6.1/14.6]? Spitzer/IRAC 5.8um band magnitudemagphot.flux.density;em.IR.4-8umfloatnullablee_5.8mag[0.002/0.2]? Uncertainty in 5.8magmagstat.errorfloatnullable8.0mag[6/14.7]? Spitzer/IRAC 8um band magnitudemagphot.flux.density;em.IR.8-15umfloatnullablee_8.0mag[0.001/1]? Uncertainty in 8.0magmagstat.errorfloatnullable24mag[6/11.2]? Spitzer/MIPS 24 micron band magnitudemagphot.flux.density;em.IR.15-30umfloatnullablee_24mag[0.007/0.08]? Uncertainty in 24magmagstat.errorfloatnullableC?meta.ref.urlintnullableSEDOpt-FIR SED plot of this starmeta.ref.urlchar