J/ApJ/914/115ivo://CDS.VizieR/J/ApJ/914/115doi:10.26093/cds/vizier.19140115CDSYasui C.2023-01-18T06:41:51Z2023-01-09T09:15:54ZCDS support team

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

cds-question@unistra.fropen-star-clustersinfrared-photometryyoung-stellar-objectsThis study presents sensitive mid-infrared (MIR) photometry obtained with the Spitzer/IRAC for a young cluster in Sh 2-208 (S208) located in one of the lowest-metallicity HII regions in the Galaxy, [O/H]=-0.8dex. Previous studies suggested that the cluster is ~0.5Myr old and has a distance of D=4kpc, which is consistent with the astrometric distance from Gaia EDR3. In a ~3.5'x4' field, 96 sources were detected in at least one MIR band at >=10{sigma}, covering intermediate-mass stars with a ~1.0M_{sun}_ mass detection limit. A total of 41 probable cluster members were identified based on the spatial distributions of spectral energy distribution slopes derived from the near-infrared (NIR) KS and IRAC bands and extinctions of the sources. The cumulative distribution of the spectral energy distribution slopes for the S208 cluster was not significantly different from those of other clusters in solar-metallicity environments with approximately the same age for intermediate-mass stars, if one also considers nondetected MIR sources identified as S208 cluster members from NIR observations. This suggests that the degree of dust growth/settling does not significantly change with metallicities as different as ~1dex. The fraction of stars with MIR disk emissions for the cluster members with >=1M_{sun}_ was 64%-93%, which is comparable to the results in solar-metallicity environments. Although this may suggest that dominant disk dispersal mechanisms for intermediate-mass stars have either no or very weak dependence on metallicity, it can be argued alternatively that this may suggest that the disk dispersal process does not work effectively at this young stage.2021ApJ...914..115Yhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/914/115CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toVII/20 : Catalogue of HII Regions (Sharpless 1959)VII/50 : CO Radial Velocities Toward Galactic H II Regions (Blitz+ 1982)VI/102 : Geneva stellar evolution tracks and isochrones (Lejeune+, 2001)II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)J/ApJ/573/366 : Infrared photometry of Trapezium cluster (Muench+, 2002)J/A+A/404/223 : 2MASS IR star clusters in the Galaxy (Bica+, 2003)J/AJ/129/856 : Herbig Ae/Be stars in nearby OB assoc. (Hernandez+, 2005)J/A+A/438/663 : JHKL photometry of 30 Dor (Maercker+, 2005)J/AJ/131/1574 : Infrared photometry of IC348 members (Lada+, 2006)J/AJ/132/2268 : SAGE calibration stars (Meixner+, 2006)J/ApJS/162/346 : Abundance gradients in the Galaxy (Rudolph+, 2006)J/ApJ/671/1784 : Ori OB1 IRAC/MIPS observations (Hernandez+, 2007)J/ApJ/674/336 : Spitzer observations of NGC 1333 (Gutermuth+, 2008)J/ApJ/686/1195 : IR photometry in the {gamma} Vel cluster (Hernandez+, 2008)J/AJ/136/18 : LMC SAGE. New candidate YSOs (Whitney+, 2008)J/ApJS/184/18 : Spitzer survey of young stellar clusters (Gutermuth+, 2009)J/AJ/138/1243 : The star formation history of the LMC (Harris+, 2009)J/A+A/503/107 : Spitzer/IRAC view of Sh2-284 (Puga+, 2009)J/A+A/509/A104 : UBVRIJHK photometry of Dolidze 25 (Delgado+, 2010)J/ApJ/721/357 : YSOs in the LMC star-forming region N206 (Romita+, 2010)J/AJ/144/192 : Spitzer survey of Orion A and B. I. YSOs (Megeath+, 2012)J/MNRAS/421/78 : LMC PMS stars mass accretion rates (Spezzi+, 2012)J/MNRAS/442/2543 : Dust disks around star in young clusters (Yasui+, 2014)J/AJ/153/240 : ALMA survey of protopl. disks in sigma Ori (Ansdell+, 2017)J/ApJ/869/L41 : DSHARP I. Sample, ALMA obs. log & overview (Andrews+, 2018)J/A+A/618/A93 : Gaia DR2 open clusters in the MW (Cantat-Gaudin+, 2018)J/ApJ/875/51 : Mass accretion rates of PMS stars. VI. LH95 (Biazzo+, 2019)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/914/115https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/914/115http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/914/115https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/914/115https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/914/115http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/914/115GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/914/115/table1 (Spitzer/IRAC point-source catalog of S208)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/914/115/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/914/115/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/914/115/table1?GETtext/xml+votable180.050000true64.8386561152.986661110.0055555555555555566/19562.0616683193919197e-20 1.6917258414975304e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/914/115?format=asciiInfrareddefaultJ/ApJ/914/115/table1Spitzer/IRAC point-source catalog of S208recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[1/96] Running sequence numbermeta.id;meta.mainintRAJ2000Right ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.mainJmag[11.9/20.43]? J-band magnitudemagphot.mag;em.IR.Jfloatnullablee_Jmag[0.01/0.17]? Uncertainty on the Jmagmagstat.error;phot.magfloatnullableHmag[12.56/17.98]? H-band magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag[0.01/0.07]? Uncertainty on the Hmagmagstat.error;phot.magfloatnullableKsmag[11.86/16.43]? Ks-band magnitudemagphot.mag;em.IR.Kfloatnullablee_Ksmag[0.01/0.06]? Uncertainty on the Ksmagmagstat.error;phot.magfloatnullable3.6mag[10.94/15.8]? Spitzer/IRAC 3.6um band magnitudemagphot.mag;em.IR.3-4umfloatnullablee_3.6mag[0.03/0.1]? Uncertainty on the 3.6magmagstat.errorfloatnullable4.5mag[10.14/15.16]? Spitzer/IRAC 4.5um band magnitudemagphot.mag;em.IR.4-8umfloatnullablee_4.5mag[0.03/0.1]? Uncertainty on the 4.5magmagstat.errorfloatnullable5.8mag[8.4/10.89]? Spitzer/IRAC 5.8um band magnitudemagphot.flux.density;em.IR.4-8umfloatnullablee_5.8mag[0.03/0.09]? Uncertainty on the 5.8magmagstat.errorfloatnullable8.0mag[8.59/9.66]? Spitzer/IRAC 8um band magnitudemagphot.flux.density;em.IR.8-15umfloatnullablee_8.0mag[0.03/0.05]? Uncertainty on the 8.0magmagstat.errorfloatnullableAv[0/15.7]? Visual extinction (1)magphys.absorptionfloatnullablealpha[-2.97/5.4] Spectral index {alpha} (2)spect.indexfloatalpha0[-2.97/3.69]? Spectral index {alpha}_0_ (2)spect.indexfloatnullableNoteNote (3)meta.code.memberchar2MDisplay the 2MASS data (II/246) within 3"meta.ref.urlchar