Torque noise models for x-ray binaries

Baykal, Altan


Timing observations from Rossi X-ray Timing Explorer (RXTE)
Beklen, Elif; Baykal, Altan; Department of Physics (2004)
In this thesis, RXTE observations of 4U 1907+09 are presented. Timing analysis of these data sets have yielded quasi periodic oscillations (QPOs) at orbital phases corresponding to the two flares in every orbital period. Known continuous spin down trend and QPO behaviour at the flares strongly suggest that a transient accretion disk occurs at the flares. Our findings strongly suggested that neutron star passes through the equatorial wind of Be companion star. During these passages a transient disk forms aro...
Pulse Profiles of Swift J1626.6+5156
Baykal, Altan; Icdem, B. (2010-08-06)
In this paper, we analyzed pulse profiles of Swift J1626.6+5156 using the lightcurves from RXTE‐PCA observations between MJD 53724 (just after the outburst) and MJD 55113 and a Chandra‐ACIS dataset on MJD 54897 with a 20 ks exposure. We found that pulse profiles show morphological variations and pulsations do not cease even ∼1200 days after the outburst. Despite these variations, we did not find any significant variation in the pulsed fraction with decreasing X‐ray flux.
Optimization of a regeneration and transformation system for lentil (lens culinaris M., cv. Sultan-I) cotyledonary petioles and epicotyls
Bayraç, Abdullah Tahir; Öktem, Hüseyin Avni; Department of Biotechnology (2004)
In this study, optimization of a transformation and regeneration system via indirect organogenesis in cotyledonary petiole tissue of lentil (Lens culinaris Medik.) was investigated. Eight different medium types differing in their plant growth regulator compositions were employed to examine the callus induction potency of cotyledonary petiole. Except two, all other tested medium yielded more than 80% callus induction. Nine different medium types were studied to test the potencies of callus structures for sho...
A preliminary version of a catalog of high-low-mass X-ray binaries
Guseinov, OH; Sayagac, AT; Allakhverdiev, A; Caliskan, H; Ozdemir, S; Yerli, Sinan Kaan; Ankay, A (2000-11-01)
We introduce a catalogue of X-ray binaries. The full catalogue is available at The aim of this catalogue is to provide basic information about X-ray sources and their counterparts. The catalog contains positions, information about distances and counterparts, spectral, photometric and timing properties of the X-ray sources in the X-ray and optical bands, as well as references. The list of references, comments and the catalog as a whole will be periodically updated to ...
Thickness analysis of thin films by energy dispersive x-ray spectroscopy
Canlı, Sedat; Turan, Raşit; Akata Kurç, Burcu; Department of Micro and Nanotechnology (2010)
EDS is a tool for quantitative and qualitative analysis of the materials. In electron microscopy, the energy of the electrons determines the depth of the region where the X-rays come from. By varying the energy of the electrons, the depth of the region where the X-rays come from can be changed. If a thin film is used as a specimen, different quantitative ratios of the elements for different electron energies can be obtained. Unique thickness of a specific film on a specific substrate gives unique energy-rat...
Citation Formats
A. Baykal, “Torque noise models for x-ray binaries,” Ph.D. - Doctoral Program, Middle East Technical University, 1991.