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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 ,
Chunping Huang  and
Yanan Wang
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.

Keywords

Compact objectNeutron starAccretion disk
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S290: Feeding Compact Objects: Accretion on All Scales , August 2012 , pp. 203 - 204
Copyright
Copyright © International Astronomical Union 2013

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