Now showing items 1-4 of 4

    • A Natural Limit on the Observable Periods of Anomalous X-ray Pulsars and Soft Gamma-ray Repeaters 

      Ertan, Ünal; Çalışkan, Şirin; Ekşi, Kazım Yavuz; Erkut, M. Hakan; Alpar, M. Ali (Amer Inst Physics, 2 Huntington Quadrangle, Ste 1No1, Melville, Ny 11747-4501 USA, 2011)
      We investigate the dependence of the evolution of neutron stars with fallback disks on the strength of the magnetic dipole field of the star. Using the same model as employed by Ertan et al. (2009), we obtain model curves ...
    • High-Frequency QPOs as a Product of Inner Disk Dynamics around Neutron Stars 

      Erkut, M. Hakan (Amer Inst Physics, 2 Huntington Quadrangle, Ste 1No1, Melville, Ny 11747-4501 USA, 2011)
      The kHz QPOs observed in a neutron star low mass X-ray binary are likely to be produced in the innermost regions of accretion disk around the neutron star. The rotational dynamics of the inner disk can be characterized by ...
    • Multi-Dimensional Weiss Operators 

      Borisenok, Sergey; Erkut, M. Hakan; Polatoğlu, Yaşar; Demirer, Murat (Scientific Technical Research Council Turkey-Tubitak, Ataturk Bulvari No 221, Kavaklidere, TR-06100 Ankara, Turkey, 2011)
      We present a solution of the Weiss operator family generalized for the case of R(d) and formulate a d-dimensional analogue of the Weiss Theorem. Most importantly, the generalization of the Weiss Theorem allows us to find ...
    • QUASI-PERIODIC OSCILLATIONS AS GLOBAL HYDRODYNAMIC MODES IN THE BOUNDARY LAYERS OF VISCOUS ACCRETION DISKS 

      Erkut, M. Hakan; Psaltis, Dimitrios; Alpar, M. Ali (IOP PUBLISHING LTD, TEMPLE CIRCUS, TEMPLE WAY, BRISTOL BS1 6BE, ENGLAND, 2008-11-10)
      The observational characteristics of quasi-periodic oscillations (QPOs) from accreting neutron stars strongly indicate the oscillatory modes in the innermost regions of accretion disks as a likely source of the QPOs. The ...