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

Published online by Cambridge University Press:  21 February 2013

Guoqiang Ding
Affiliation:
Xinjiang Astronomical Observatory, Chinese Academy of Sciences, 150, Science 1-Street, Urumqi, Xinjiang 830011, China email: dinggq@gmail.com
Chunping Huang
Affiliation:
Xinjiang Astronomical Observatory, Chinese Academy of Sciences, 150, Science 1-Street, Urumqi, Xinjiang 830011, China email: dinggq@gmail.com University of Chinese Academy of Sciences, China
Yanan Wang
Affiliation:
Xinjiang Astronomical Observatory, Chinese Academy of Sciences, 150, Science 1-Street, Urumqi, Xinjiang 830011, China email: dinggq@gmail.com University of Chinese Academy of Sciences, China
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Abstract

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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.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2013

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