J/other/JApA/34.ivo://CDS.VizieR/J/other/JApA/34.393CDSBhatt H.Pandey J.C.Singh K.P.Sagar R.Kumar B.2026-01-13T20:42:52Z2014-02-03T09:28:41ZCDS support team

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

cds-question@unistra.fropen-star-clustersx-ray-sourcesinfrared-sourcesWe present a detailed investigation of X-ray source contents of eight young open clusters with ages between 4 to 46Myr using archival X-ray data from XMM-Newton. The probable cluster memberships of the X-ray sources have been established on the basis of multi-wavelength archival data, and samples of 152 pre-main sequence (PMS) low mass (<2M_{sun}_), 36 intermediate mass (2-10M_{sun}_) and 16 massive (>10M_{sun}_) stars have been generated. X-ray spectral analyses of high mass stars reveal the presence of high temperature plasma with temperature <2keV, and mean L_X_/L_bol_ of 10^-6.9^. In the case of PMS low mass stars, the plasma temperatures have been found to be in the range of 0.2keV to 3keV with a median value of ~1.3keV, with no significant difference in plasma temperatures during their evolution from 4 to 46Myr. The X-ray luminosity distributions of the PMS low mass stars have been found to be similar in the young star clusters under study. This may suggest a nearly uniform X-ray activity in the PMS low mass stars of ages ~4--14Myr. These observed values of L_X)/L_bol_ are found to have a mean value of 10^-3.6^+/-0.4, which is below the X-ray saturation level. The L_X_/L_bol_ values for the PMS low mass stars are well correlated with their bolometric luminosities, that implies its dependence on the internal structure of the low mass stars. The difference between the X-ray luminosity distributions of the intermediate mass stars and the PMS low mass stars has not been found to be statistically significant. Their L_X_/L_bol_ values, however have been found to be significantly different from each other with a confidence level greater than 99.999% and the strength of X-ray activity in the intermediate mass stars is found to be lower compared to the low mass stars. However, the possibility of X-ray emission from the intermediate mass stars due to a low mass star in close proximity of the intermediate mass star can not be ruled out.2013JApA...34..393Bhttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/other/JApA/34.393CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toII/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/other/JApA/34.393https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/other/JApA/34.393http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/other/JApA/34.393https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/other/JApA/34.393https://vizier.iucaa.in/viz-bin/votable?-source=J/other/JApA/34.393http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/other/JApA/34.393GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/other/JApA/34.393/table3 (X-ray source detected in eight clusters with their identification)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/other/JApA/34.393/table3?https://vizier.iucaa.in/viz-bin/conesearch/J/other/JApA/34.393/table3?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/other/JApA/34.393/table3?GETtext/xml+votable180.050000true26.17708461.1410830.005555555555555556Cone search capability for table J/other/JApA/34.393/table5 (Spectral and timing properties of intermediate and low mass stars in eight young open clusters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/other/JApA/34.393/table5?https://vizier.iucaa.in/viz-bin/conesearch/J/other/JApA/34.393/table5?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/other/JApA/34.393/table5?GETtext/xml+votable180.050000true26.5834661.2639730.0055555555555555566/3256-3258 3632 14263 14644 14646-14647 37230-37231 37926 41658 430247.952274030004205e-20 1.7798557115773645e-19https://cdsarc.cds.unistra.fr/viz-bin/moc/J/other/JApA/34.393?format=asciiX-rayInfrareddefaultJ/other/JApA/34.393/table3X-ray source detected in eight clusters with their identificationn_IDmeta.ref.urlrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintClusterName of the Clustermeta.id.parentcharID[1/208] Identification number of X-ray sources detected using SAS task edetect_chain, within the clustermeta.id;meta.mainintRAJ2000Right ascension of source (J2000)degpos.eq.ra;meta.mainDEJ2000Declination of source (J2000)degpos.eq.dec;meta.mainePosError in the estimation of position from X-ray source detection algorithmarcsecstat.error;posfloate_CRpnrms uncertainty on CRpnct/ksstat.errorfloatCRpnCount rates in energy band 0.3-7.5keV from SAS task edetect_chain in PN detectorct/ksphot.count;em.X-rayfloatCRm1? Count rate in energy band 0.3-7.5keV from SAS task edetect_chain in MOS1 detectorct/ksphot.count;em.X-rayfloatnullablee_CRm1? rms uncertainty on CRm1ct/ksstat.errorfloatnullableCRm2Count rate in energy band 0.3-7.5keV from SAS task edetect_chain in MOS2 detectorct/ksphot.count;em.X-rayfloate_CRm2? rms uncertainty on CRm2ct/ksstat.errorfloatnullableDistDistance of the source from the center of the clusterarcminpos.angDistancefloatN2MNumber of multiple identifications of a X-ray source in 2MASS NIR source catalogue within 10" search radiusmeta.numberintr2M? Distance between the positions of the X-ray source and of its closest NIR within 10" search radius (1)arcsecpos;arith.difffloatnullableJmag? Magnitude of the closest X-ray counterpart in J (1.25{mu}m) bandmagphot.mag;em.IR.Jfloatnullablee_Jmag? rms uncertainty on Jmagmagstat.error;phot.magfloatnullableHmag? Magnitude of the closest X-ray counterpart in H (1.65{mu}m) bandmagphot.mag;em.IR.Hfloatnullablee_Hmag? rms uncertainty on Hmagmagstat.error;phot.magfloatnullableKsmag? Magnitude of the closest X-ray counterpart in Ks (2.17{mu}m) bandmagphot.mag;em.IR.Kfloatnullablee_Ksmag? rms uncertainty on Ksmagmagstat.error;phot.magfloatnullableMm[Y/N] Membership of X-ray source in their corresponding cluster (2)meta.code.membercharMassMass of the source estimated from color-magnitude diagrams of the clusters for cluster members ("<2", "2-10", or ">10")solMassphys.masscharNotesThe information of the source from Vizier database (3)meta.notecharJ/other/JApA/34.393/table4X-ray temperatures and luminosities of massive stars in the eight clustersE_kTav? Error on kTav (upper value)keVstat.error;stat.maxfloatnullablerecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintClusterName of the Clustermeta.id.parentcharID[1/208] Identification number of X-ray sourcemeta.id;meta.mainintNameName of the sourcemeta.idcharSpTypeMK spectral type of the X-ray sourcesrc.spTypecharBin[Y] Y: star is in binary systemmeta.codecharOffOffset between the position of Massive stars in 2MASS catalogue and their X-ray counterpartsarcsecpos;arith.difffloatkTav? Average X-ray temperature of massive stars within young clusterskeVphys.temperature;stat.meanfloatnullablee_kTav? Error on kTav (lower value)keVstat.errorfloatnullablekTavu? Upper value of kTav interval when intervalkeVphys.temperaturefloatnullablelogLXX-ray luminosity of massive stars within young clusters (1)log(1e-07W)phys.luminosity;em.X-rayfloatn_logLX[+] Note on logLX (2)meta.notecharr_logLXReference for logLXmeta.ref;pos.framecharlogLX/b? Ratio of X-ray to bolometric luminositiesphys.luminosity;arith.ratiofloatnullableJ/other/JApA/34.393/table5Spectral and timing properties of intermediate and low mass stars in eight young open clustersrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintClusterName of the Clustermeta.id.parentcharID[1/208] Identification number of X-ray sourcemeta.id;meta.mainintn_ID[IL] Intermediate mass (2-10M_{sun}_) or Low mass (<2M_{sun}_) starmeta.notecharRAJ2000Right ascension of source (J2000)degpos.eq.ra;meta.mainDEJ2000Declination of source (J2000)degpos.eq.dec;meta.mainl_kTLimit flag on kTmeta.code.error;phys.energycharkT? X-ray temperatures of intermediate and low mass starskeVphys.massfloatnullableE_kT? Error on kT (upper value)keVstat.error;stat.maxfloatnullablee_kT? Error on kT (upper value)keVstat.error;phys.energyfloatnullablel_logEMLimit flag on logEMmeta.code.errorcharlogEM? Emission measurelog(cm**-3)phys.emissMeasurefloatnullableE_logEM? Error on logEM (upper value)log(cm**-3)stat.error;stat.maxfloatnullablee_logEM? Error on logEM (lower value)log(cm**-3)stat.errorfloatnullablel_logLXLimit flag on logLXmeta.code.errorcharlogLX? X-ray luminosities of intermediate and low mass stars (1)log(1e-07W)phys.luminosity;em.X-rayfloatnullableu_logLX[?] Uncertainty flag on logLXmeta.code.errorcharl_logLX/bLimit flag on logLX/bmeta.code.errorcharlogLX/b? Ratio of X-ray to bolometric luminositiesphys.luminosity;arith.ratiofloatnullableu_logLX/b[?] Uncertainty flag on logLX/bmeta.code.errorcharTsize? Time Bin size for timing analysisstime.intervalintnullableFvar? Fractional root mean square variability amplitudestat.variancefloatnullablee_Fvar? rms uncertainty on Fvarstat.errorfloatnullableNoteNotesmeta.notechar