J/ApJ/715/671ivo://CDS.VizieR/J/ApJ/715/671doi:10.26093/cds/vizier.17150671CDSWolk S.J.Winston E.Bourke T.L.Gutermuth R.Megeath S.T.,Spitzbart B.D.Osten R.2017-06-26T11:50:00Z2012-06-14T16:05:25ZCDS support team

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

cds-question@unistra.frx-ray-sourcespre-main-sequence-starsyoung-stellar-objectsinfrared-photometrystellar-spectral-typesline-intensitiesWe report on a multiwavelength study of a partially embedded region of star formation centered on the Herbig Be star LkH{alpha} 101. Using two 40ks Chandra observations, we detect 213 X-ray sources in the ~17'x17' ACIS-I field. We combine the X-ray data with Two Micron All Sky Survey near-IR observations and Spitzer IRAC and MIPS 24um observations to obtain a complete picture of the cluster. A total of 158 of the X-ray sources have infrared counterparts. Of these, we find nine protostars, 48 Class II objects, five transition objects, and 72 Class III objects. From the Spitzer data we identify an additional 10 protostars, 53 Class II objects, and four transition disk candidates which are not detected by Chandra. We obtained optical spectra of a sample of both X-ray-detected and non-X-ray-detected objects. Combining the X-ray, Spitzer, and spectral data, we obtain independent estimates of cluster distance and the total cluster size -excluding protostars. We obtain consistent distance estimates of 510^+100^_-40_pc and a total cluster size of 255^+50^_-25_ stars. We find the Class II:III ratio is about 5:7 with some evidence that the Class III sources are spatially more dispersed. The cluster appears very young with three sites of active star formation and a median age of about 1Myr.2010ApJ...715..671Whttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/715/671CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/chandra : The Chandra Archive Log (CXC, 1999-2012)B/mk : Catalogue of Stellar Spectral Classifications (Skiff, 2012)II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)J/ApJS/184/18 : Spitzer survey of young stellar clusters (Gutermuth+, 2009)J/AJ/128/1233 : LkHa 101 and the young cluster in NGC 1579 (Herbig+, 2004)J/AJ/126/1916 : JHK photometry of young clusters near the Sun (Porras+, 2003)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/715/671https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/715/671http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/715/671https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/715/671https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/715/671http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/715/671GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/715/671/table1 (X-ray sources detected in the LkH{alpha} 101 field)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/715/671/table1?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/715/671/table1?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/715/671/table1?GETtext/xml+votable180.050000true67.678041735.22313890.005555555555555556Cone search capability for table J/ApJ/715/671/notXray (PMS stars detected by Spitzer but not detected in X-rays)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/715/671/notXray?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/715/671/notXray?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/715/671/notXray?GETtext/xml+votable180.050000true67.40935.316750.0055555555555555566/12316.772611666688002e-21 1.7003137259100215e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/715/671?format=asciiX-rayOpticalInfrareddefaultJ/ApJ/715/671/table1X-ray sources detected in the LkH{alpha} 101 fieldrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[2/231] Running source number (skips indicate the spurious detections)meta.id;meta.mainintprimaryMSimbad column added by the CDSmeta.ref.urlcharIDSource identification; (HHMMSS.ss+DDMMSS.s; <LkHa101CXO JHHMMSS.ss+DDMMSS.s> in Simbad)meta.idcharOffOffset from axisarcsecinstr.offsetfloatRCtsRaw countsctphot.count;em.X-rayintNCtsNet countsctphot.count;em.X-rayfloatG09Cross-match with Gutermuth et al. 2009, Cat. J/ApJS/184/18 within 5"meta.ref.urlintnullableSimbadSimbad column added by the CDSmeta.refchar_RAPositions from LkHa101CXO name (right ascension part)degpos.eq.ra;meta.main_DEPositions from LkHa101CXO name (declination part)degpos.eq.dec;meta.mainJ/ApJ/715/671/phot2MASS and Spitzer photometry of the X-ray sourcesrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[2/231] Source index numbermeta.id;meta.mainintX/2MX-ray/2MASS positional offsetarcsecpos;arith.difffloatnullableOff2MOffset from axisarcsecpos;arith.difffloatnullableJmag2MASS J band magnitudemagphot.mag;em.IR.Jfloatnullablee_Jmag? Uncertainty in Jmagmagstat.error;phot.mag;em.IR.JfloatnullableHmag2MASS H band magnitudemagphot.mag;em.IR.Hfloatnullablee_Hmag? Uncertainty in Hmagmagstat.error;phot.mag;em.IR.HfloatnullableKmag2MASS K band magnitudemagphot.mag;em.IR.Kfloatnullablee_Kmag? Uncertainty in Kmagmagstat.error;phot.mag;em.IR.KfloatnullableQual2MASS photometry quality codesmeta.code;photcharX/SptzX-ray/Spitzer positional offsetarcsecpos;arith.difffloatOffOffset from axisarcsecpos;arith.difffloat[3.6]? Spitzer/IRAC 3.6 micron band magnitudemagphot.mag;em.IR.3-4umfloatnullablee_[3.6]? Uncertainty in [3.6]magstat.errorfloatnullable[4.5]? Spitzer/IRAC 4.5 micron band magnitudemagphot.mag;em.IR.4-8umfloatnullablee_[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 8.0 micron band magnitudemagphot.flux.density;em.IR.8-15umfloatnullablee_[8.0]? Uncertainty in [8.0]magstat.errorfloatnullable[24]? Spitzer/MIPS 24 micron band magnitudemagphot.flux.density;em.IR.15-30umfloatnullablee_[24]? Uncertainty in [24]magstat.errorfloatnullableAKThe K band extinctionmagphys.absorptionfloatClassSource classification (1, 2, III, T(transition), gal (background galaxy), or LkH{alpha} 101)src.classf_Class[b] b: star within 90" of LkH{alpha} 101 (2)meta.codechar2MDisplay the 2MASS data (Cutri et al. 2003, Cat. II/246)meta.ref.urlcharJ/ApJ/715/671/table4LkH{alpha} 101 cluster spectral classificationSpTMK spectral typesrc.spTypecharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[2/231]? Chandra identification numbermeta.id;meta.mainintnullableIDLkHaSST identification (HHMMSS.ss+DDMMSS.s; <LkHa101SST JHHMMSS.ss+DDMMSS.s> in Simbad)meta.idchare_SpTSpT uncertaintystat.errorfloatTeffEffective temperatureKphys.temperature.effectiveintlogLOverall luminosity log(L_bol_/L_0_)phys.luminosityfloatEWHaH{alpha} (6563{AA}) equivalent width0.1nmspect.line.eqWidth;em.line.HalphadoubleEWLi? LiI (6707{AA}) equivalent width0.1nmspect.line.eqWidthfloatnullableJ/ApJ/715/671/fitsSpectral fits to X-ray sources (good or lower quality)chi2The reduced {chi}^2^ of the fit (1)stat.fit.param;meta.modelledfloatModelModel used in fit (2)instr.setup;meta.modelledcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeq[2/231] Source index numbermeta.id;meta.mainintQSimbad column added by the CDSmeta.code.qualcharNCtsNet countsctphot.count;em.X-rayfloatNHHydrogen column density1e+22cm**-2phys.columnDensityfloate_NH? The 1{sigma} uncertainty in NH1e+22cm**-2stat.errorfloatnullablel_kTLimit flag on kTmeta.code.error;phys.energycharkTEffective temperaturekeVphys.temperature.effectivefloate_kT? The 1{sigma} uncertainty in kTkeVstat.error;phys.energyfloatnullablelogF.ALog of Absorbed flux; erg/s/cm^2^log(mW.m**-2)phot.flux;em.X-rayfloatlogF.ULog of Unabsorbed flux; erg/s/cm^2^log(mW.m**-2)phot.flux;em.X-rayfloatJ/ApJ/715/671/notXrayPMS stars detected by Spitzer but not detected in X-raysrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintIDSource identification; (HHMMSS.ss+DDMMSS.s; <LkHa101SST JHHMMSS.ss+DDMMSS.s> in Simbad) (1)meta.idcharJmag? 2MASS J band magnitudemagphot.mag;em.IR.Jfloatnullablee_Jmag? Uncertainty in Jmagmagstat.error;phot.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 Kmagmagstat.error;phot.mag;em.IR.KfloatnullableQual2MASS photometry quality codesmeta.code;photcharG09Cross-match with Gutermuth et al. 2009, Cat. J/ApJS/184/18 within 5"meta.ref.urlintnullable2MDisplay the 2MASS data (Cutri et al. 2003, Cat. II/246)meta.ref.urlcharf_ID[*] outside Chandra field of view (1)meta.codechar[3.6]Spitzer/IRAC 3.6 micron band magnitudemagphot.mag;em.IR.3-4umfloate_[3.6]Uncertainty in [3.6]magstat.errorfloat[4.5]? Spitzer/IRAC 4.5 micron band magnitudemagphot.mag;em.IR.4-8umfloatnullablee_[4.5]? Uncertainty in [4.5]magstat.errorfloatnullable[5.6]? Spitzer/IRAC 5.6 micron band magnitudemagphot.flux.density;em.IR.4-8umfloatnullablee_[5.6]? Uncertainty in [5.6]magstat.errorfloatnullable[8.0]? Spitzer/IRAC 8.0 micron band magnitudemagphot.flux.density;em.IR.8-15umfloatnullablee_[8.0]? Uncertainty in [8.0]magstat.errorfloatnullable[24]? Spitzer/MIPS 24 micron band magnitudemagphot.flux.density;em.IR.15-30umfloatnullablee_[24]? Uncertainty in [24]magstat.errorfloatnullableAKThe K band extinctionmagphys.absorptionfloatCl[012T] Classification (Class 0, I, II or T=possible transition objects)meta.code.class;src.classcharSimbadSimbad column added by the CDSmeta.refchar_RAPositions from LkHa101SST name (right ascension part)degpos.eq.ra;meta.main_DEPositions from LkHa101SST name (declination part)degpos.eq.dec;meta.main