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dc.contributor.authorAcuner, Z.
dc.contributor.authorInam, S.C.
dc.contributor.authorSahiner, S.
dc.contributor.authorSerim, M.M.
dc.contributor.authorBaykal, A.
dc.contributor.authorSwank, J.
dc.date.accessioned2019-12-17T08:02:07Z
dc.date.available2019-12-17T08:02:07Z
dc.date.issued2014
dc.identifier.issn0035-8711
dc.identifier.urihttps://academic.oup.com/mnras/article/444/1/457/1009862
dc.identifier.urihttp://hdl.handle.net/11727/4462
dc.description.abstractWe present a timing analysis of X Persei (X Per) using observations made between 1998 and 2010 with the Proportional Counter Array (PCA) onboard the Rossi X-ray Timing Explorer (RXTE) and with the INTEGRAL Soft Gamma-Ray Imager (ISGRI). All pulse arrival times obtained from the RXTE-PCA observations are phase-connected and a timing solution is obtained using these arrival times. We update the long-term pulse frequency history of the source by measuring its pulse frequencies using RXTE-PCA and ISGRI data. From the RXTE-PCA data, the relation between the frequency derivative and X-ray flux suggests accretion via the companion's stellar wind. However, the detection of a transient quasi-periodic oscillation feature, peaking at similar to 0.2 Hz, suggests the existence of an accretion disc. We find that double-break models fit the average power spectra well, which suggests that the source has at least two different accretion flow components dominating the overall flow. From the power spectrum of frequency derivatives, we measure a power-law index of similar to-1, which implies that, on short time-scales, disc accretion dominates over noise, while on time-scales longer than the viscous time-scales, the noise dominates. From pulse profiles, we find a correlation between the pulse fraction and the count rate of the source.en_US
dc.language.isoengen_US
dc.relation.isversionof10.1093/mnras/stu1351en_US
dc.rightsinfo:eu-repo/semantics/openAccessen_US
dc.subjectaccretion, accretion discsen_US
dc.subjectstars: neutronen_US
dc.subjectpulsars: individual: X Perseien_US
dc.subjectX-rays: binariesen_US
dc.titleTiming studies of X Persei and the discovery of its transient quasi-periodic oscillation featureen_US
dc.typearticleen_US
dc.relation.journalMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETYen_US
dc.identifier.volume444en_US
dc.identifier.issue1en_US
dc.identifier.startpage457en_US
dc.identifier.endpage465en_US
dc.identifier.wos000342925100036en_US
dc.identifier.scopus2-s2.0-84913568713en_US
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergien_US


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