Timing studies of X Persei and the discovery of its transient quasi-periodic oscillation feature

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2014-10-11

Author

Acuner, Z.
İNAM, SITKI ÇAĞDAŞ
Sahiner, S.
Serim, Muhammed Miraç
Baykal, Altan
Swank, J.

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We 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.

Subject Keywords

Accretion, Accretion discs, Stars, Neutron, Pulsars, Individual, X Persei, X-rays, Binaries

URI

https://hdl.handle.net/11511/48231

Journal

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY

DOI

https://doi.org/10.1093/mnras/stu1351

Collections

Department of Physics, Article

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Citation Formats

Z. Acuner, S. Ç. İNAM, S. Sahiner, M. M. Serim, A. Baykal, and J. Swank, “Timing studies of X Persei and the discovery of its transient quasi-periodic oscillation feature,” MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, pp. 457–465, 2014, Accessed: 00, 2020. [Online]. Available: https://hdl.handle.net/11511/48231.