J/A+A/533/A121ivo://CDS.VizieR/J/A+A/533/A121doi:10.26093/cds/vizier.35330121CDSMucciarelli P.Preibisch T.Zinnecker H.2017-07-06T06:25:33Z2011-09-13T08:21:49ZCDS support team

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

cds-question@unistra.frpre-main-sequence-starsyoung-stellar-objectsprotostarsx-ray-sourcesThe aim of this study was to find an explanation for the remarkable morphology of the central part of the S254-S258 star forming complex. We performed a deep Chandra X-ray observation of the S254-S258 region in order to efficiently discriminate young stars (with and without circumstellar matter) from the numerous older field stars in the area. We detected 364 X-ray point sources in a 17'x17' field. This X-ray catalog provides, for the first time, a complete sample of all young stars in the region down to about 0.5M_{sun}_.2011A&A...533A.121Mhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/533/A121CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)J/ApJ/682/445 : Spitzer observations of S254-S258 (Chavarria+, 2008)B/chandra : The Chandra Archive Log (CXC, 1999-)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/533/A121https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/533/A121http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/533/A121https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/533/A121https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/533/A121http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/533/A121GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/533/A121/catalog (Chandra catalog: basic source properties, X-ray fluxes and cross-correlation with optical and IR catalogs)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/533/A121/catalog?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/533/A121/catalog?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/533/A121/catalog?GETtext/xml+votable180.050000true92.949228918.05350810.0055555555555555566/23968-23969https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/533/A121?format=asciiX-raydefaultJ/A+A/533/A121/catalogChandra catalog: basic source properties, X-ray fluxes and cross-correlation with optical and IR catalogsSimbadNameSimbad column added by the CDSmeta.idcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintSeqX-ray catalog sequence number, sorted by RA.meta.id;meta.mainintn_Seq[*] indicates brighter sources having spectral fit (slightly different) in table 4 of papermeta.notecharCXOUIAU J designation (HHMMSS.ss+DDMMSS.s)meta.id;meta.maincharFlux2Incident full band [0.5-8.0]keV flux from AE software, calculated using the scalar mean of the ancillary response function (ARF)ph.cm**-2.s**-1phot.flux;em.X-rayfloatlogLh? Apparent hard band [2.0-8.0]keV luminositylog(1e-07W)phys.luminosity;em.X-rayfloatnullablelogLhc? Intrinsic hard band [2.0-8.0]keV luminosity (corrected for absorption)log(1e-07W)phys.luminosity;em.X-rayfloatnullablelogLt? Apparent full band [0.5-8.0]keV luminositylog(1e-07W)phys.luminosity;em.X-rayfloatnullablelogLtc? Intrinsic full band [0.5-8.0]keV luminositylog(1e-07W)phys.luminosity;em.X-rayfloatnullableePosEstimated standard deviation of the random component of the position error (1)arcsecstat.stdevfloatthetaOff-axis anglearcmininstr.offsetfloatCtNet counts extracted in the total energy band (0.5-8keV)ctphot.count;em.X-rayfloate_CtAverage of upper and lower 1{sigma} errorsctstat.errorfloatCt.bgBackground counts expected in the source extraction region (total band)ctphot.count;em.X-rayfloatCt.hNet counts extracted in the hard energy band (2-8keV)ctphot.count;em.X-rayfloatf.PSFFraction of the PSF (at 1.497keV) enclosed within the extraction region (2)instr.det.psffloatSigniPhotometric significance computed as net counts divided by the upper error on net countsmeta.notefloatl_logPbLimit flag on logPbmeta.code.errorcharlogPbLogarithmic probability that extracted counts (total band) are solely from background (3)stat.fit.goodnessfloatAnom[geps ] Source anomalies (only 'g' present) (4)meta.notecharVar[abc] Variability characterization based on K-S statistic (c=variable, total band) (5)meta.code;src.varcharTexpEffective exposure time (6)kstime.duration;obs.exposurefloatEmedBackground-corrected median photon energy (total band)keVem.energyfloatDSS[y-] Optical counterpart in at least the DSS red imagemeta.codechar2M[JHK-] Counterpart in the 2MASS catalog in the J, H or K bandmeta.codecharC08[y-] Counterpart in the Spitzer catalog from Chavarria et al. (2008, Cat. J/ApJ/682/445)meta.codecharClassIR classification is reported when available (7)src.classnullableRAJ2000Right ascension in decimal degrees (J2000)degpos.eq.ra;meta.mainDEJ2000Declination in decimal degrees (J2000)degpos.eq.dec;meta.main