J/A+A/480/397ivo://CDS.VizieR/J/A+A/480/397doi:10.26093/cds/vizier.34800397CDSServillat M.Webb N.A.Barret D.2017-07-10T13:26:10Z2008-10-19T15:02:38ZCDS support team

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

cds-question@unistra.frglobular-star-clustersx-ray-sourcesGalactic globular clusters harbour binary systems that are detected as faint X-ray sources. These close binaries are thought to play an important role in the stability of the clusters by liberating energy and delaying the inevitable core collapse of globular clusters. The inventory of close binaries and their identification is therefore essential. We present XMM-Newton observations of two Galactic globular clusters: NGC 2808 and NGC 4372. We use X-ray spectral and variability analysis combined with ultra-violet observations made with the XMM-Newton optical monitor and published data from the Hubble Space Telescope to identify sources associated with the clusters. We compare the results of our observations with estimates from population synthesis models.2008A&A...480..397Shttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/480/397CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toB/xmm : XMM-Newton Observation Log (XMM-Newton SOC, 2007)J/A+A/309/116 : 10 globular cluster ROSAT observations (Johnston+, 1996)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/480/397https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/480/397http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/480/397https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/480/397https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/480/397http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/480/397GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/A+A/480/397/Xsources (X-ray source properties in the 2 globular clusters NGC 2808 and NGC 4372)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/A+A/480/397/Xsources?https://vizier.iucaa.in/viz-bin/conesearch/J/A+A/480/397/Xsources?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/A+A/480/397/Xsources?GETtext/xml+votable180.050000true138.018-64.850.0055555555555555566/37291 37294 37633 37636 41507 41513https://cdsarc.cds.unistra.fr/viz-bin/moc/J/A+A/480/397?format=asciiX-raydefaultJ/A+A/480/397/XsourcesX-ray source properties in the 2 globular clusters NGC 2808 and NGC 4372recnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNGCSimbad column added by the CDSmeta.id.parentchar[SWB2008]Sequential number (1)meta.recordcharRAJ2000X-ray Right ascension (J2000)pos.eq.ra;meta.mainDEJ2000X-ray Declination (J2000)pos.eq.dec;meta.maine_PosPositional errorarcsecstat.errorfloatCRCount ratect/ksphot.count;em.X-rayfloate_CRrms uncertainty on CRct/ksstat.errorfloatFluxFlux converted with ECFs in band 0.5-10keVaW.m**-2phot.flux;em.X-ray.mediumfloate_Fluxrms uncertainty on FluxaW.m**-2stat.error;phot.fluxfloatHR1Hardness ratio 1 (2)phot.flux;arith.ratiofloatHR2Hardness ratio 2 (2)phot.flux;arith.ratiofloat