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2 results

  • Determining the neutron star surface magnetic field strength of two Z sources

  • Guoqiang Ding, Chunping Huang, Yanan Wang
  • Journal:
    Proceedings of the International Astronomical Union / Volume 8 / Issue S290 / August 2012
    Published online by Cambridge University Press:
    21 February 2013, pp. 203-204
    Print publication:
    August 2012
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  • From the extreme position of disk motion, we infer the neutron star (NS) surface magnetic field strength (B0) of Z-source GX 17+2 and Cyg X-2. The inferred B0 of GX 17+2 and Cyg X-2 are ~(1–5)×108 G and ~(1–3)×108 G, respectively, which are not inferior to that of millisecond X-ray pulsars or atoll sources. It is likely that the NS magnetic axis of Z sources is parallel to the axis of rotation, which could result in the lack of pulsations in these sources.

  • The evolution of inner disk radius with orbital phase in Circinus X-1

  • Yanan Wang, Guoqiang Ding, Chunping Huang
  • Journal:
    Proceedings of the International Astronomical Union / Volume 8 / Issue S290 / August 2012
    Published online by Cambridge University Press:
    21 February 2013, pp. 337-338
    Print publication:
    August 2012
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  • Using RXTE observations, we investigate the evolution of inner disk radius (Rin) of Cir X-1 during two cycles and find obvious orbital modulation. We argue that the modulation is attributed to its high orbital eccentricity. The disk luminosity is inversely with the inner disk temperature (kTin), which is ascribed to the slow increase of kTin and, however, the rapid decrease of Rin during the passage for the neutron star to depart from the companion star.