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  • Accretion-powered Millisecond Pulsars -- Anomalous Pulse Phase Variations and Energy Dependent Phase Lag


        What:
    Accretion-powered Millisecond Pulsars -AnomalousPuls Phase

     

     
    Variations and Energy Dependent Phase Lag
     
    Who:

     

     Dr. Chou,Y

     
     
    (National Central University,Taiwan )
     
     
       
    When:
    Thursday afternoon ,Dec.,04th,2:30 p.m.
     
     
     
     
      
     
     
    Room 327, Office Block, 2 West Beijing Road (PMO, CAS)
     
     
    Where:
     

       abstract

      Low Mass X-ray Binaries (LMXBs) are considered to be the progenitor of the millisecond  pulsars detected in the radio band. However,  the attempts to measure coherent millisecond  pulsation from an LMXB, which provides a direct evolutionary link between radio millisecond  pulsar and LMXB, were unsuccessful until the discovery of the first accretion-powered  millisecond pulsar SAX 1808.4-3658 in 1998. To date, coherent millisecond pulsations have been  detected in ten LMXBs with spin periods ranging from 1.67 ms to 5.5 ms. Although the material  accreting onto the neutron star through the magnetic field lines is from the inner part of the  disk, unlike the regular accreting pulsar (hundreds of millisecond to several second), their  fast rotation speeds and the low magnetic fields (10 8 -10 9 G) imply that their radii of the  inner disk edges are only several factors larger than the neutron star. This different type of  accretion can further improve our knowledge for X-ray binaries, as well as the nature of the  neutron star. In this talk, I will introduce interesting discoveries from our studies for  several of these accretion-powered millisecond pulsars, including the anomalous pulse phase  variations and the implication from the abnormal energy dependent phase lag.
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