J/ApJ/747/77ivo://CDS.VizieR/J/ApJ/747/77doi:10.26093/cds/vizier.17470077CDSGuver T.Ozel F.Psaltis D.2017-07-06T06:25:32Z2013-10-28T07:41:00ZCDS support team

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

cds-question@unistra.frx-ray-binary-starsspectroscopyTime-resolved X-ray spectroscopy of thermonuclear bursts observed from low-mass X-ray binaries offer a unique tool to measure neutron-star masses and radii. In this paper, we continue our systematic analysis of all the X-ray bursts observed with Rossi X-ray Timing Explorer from X-ray binaries. We determine the events that show clear evidence for photospheric radius expansion and measure the Eddington limits for these accreting neutron stars using the bolometric fluxes attained at the touchdown moments of each X-ray burst. We employ a Bayesian technique to investigate the degree to which the Eddington limit for each source remains constant between bursts. We find that for sources with a large number of radius expansion bursts, systematic uncertainties are at a 5%-10% level. Moreover, in six sources with only pairs of Eddington-limited bursts, the distribution of fluxes is consistent with a ~10% fractional dispersion. This indicates that the spectroscopic measurements of neutron-star masses and radii using thermonuclear X-ray bursts can reach the level of accuracy required to distinguish between different neutron-star equations of state, provided that uncertainties related to the overall flux calibration of X-ray detectors are of comparable magnitude.2012ApJ...747...77Ghttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/ApJ/747/77CatalogResearchIsServedByTAP VizieR generic serviceIsServedByConesearch servicerelated-toJ/ApJ/738/128 : RXTE observations of 4U 1728-34 (Seifina+, 2011)J/PAZh/37/651 : Hard X-ray bursts by INTEGRAL in 2003-2009 (Chelovekov+, 2011)J/ApJ/716/L109 : Radio and X-ray observations of Aql X-1 (Miller-Jones+, 2010)J/ApJS/179/360 : Thermonuclear X-ray bursts observed by RXTE (Galloway+, 2008)J/ApJ/685/436 : X-ray variability in 4U 1636-53 (Altamirano+, 2008)J/A+A/458/21 : INTEGRAL burst observations of 4U 1728-34 (Falanga+, 2006)https://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/ApJ/747/77https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/ApJ/747/77http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/ApJ/747/77https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/ApJ/747/77https://vizier.iucaa.in/viz-bin/votable?-source=J/ApJ/747/77http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/ApJ/747/77GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapCone search capability for table J/ApJ/747/77/lmxb (Low-mass X-ray binaries with PRE events parameters)https://vizier.cds.unistra.fr/viz-bin/conesearch/J/ApJ/747/77/lmxb?https://vizier.iucaa.in/viz-bin/conesearch/J/ApJ/747/77/lmxb?http://vizieridia.saao.ac.za/viz-bin/conesearch/J/ApJ/747/77/lmxb?GETtext/xml+votable180.050000true78.5274583-40.04361110.0055555555555555566/28705 28808 28828 28835 28862 29267 30299 34242 42140 42315 42384 42387https://cdsarc.cds.unistra.fr/viz-bin/moc/J/ApJ/747/77?format=asciiOpticaldefaultJ/ApJ/747/77/lmxbLow-mass X-ray binaries with PRE events parametersLCShow the light curvemeta.ref.urlcharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintNameSource namemeta.numbercharprimaryNbNumber of bursts (1)meta.numberintNpreNumber of PRE bursts (2)meta.numberintNgamNumber of bursts exceeding {gamma} limit (3)meta.numberintN.PRE? Final number of PRE eventsmeta.numberintnullablef_N.PRE[d] Excluded burst (4)meta.codecharG08Display the source properties from Galloway+, Cat. J/ApJS/179/360meta.ref.urlcharSimbadSimbad column added by the CDSmeta.refcharNEDSimbad column added by the CDSmeta.refcharFlux[1.19/10.44] Touchdown flux at 2.5-25.0 keV in units of 10^-8^erg/s/cm^2^1e-11W.m**-2phot.flux;em.X-rayfloatnullableeSys[0/2.3]? Systematic uncertainty (5)1e-11W.m**-2stat.error.sysfloatnullableeForm[0/0.3] Formal uncertainty (6)1e-11W.m**-2stat.errorfloatnullable_RAPositions from SIMBAD database (right ascension part)degpos.eq.ra;meta.main_DEPositions from SIMBAD database (declination part)degpos.eq.dec;meta.mainJ/ApJ/747/77/table2Measured touchdown flux values from PRE eventsNameSource namemeta.id;meta.maincharrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintBID[1/168] Burst identification number (1)meta.idintMJD[50128.8/54043.7] Modified Julian datetime.epochdoubleFlux[1.06/12.16] Touchdown flux at 2.5-25.0 keV (2)1e-11W.m**-2phot.flux;em.X-rayfloate_Flux[0.06/0.4] Flux uncertainty (2)1e-11W.m**-2stat.error;phot.fluxfloatRatio[1.6/34] Normalization ratio A_peak_/A_cool_ (in cooling tail)phot.flux;arith.ratiofloat