The Nature of AX J0051-733 in the SMC: A Pulsar Born with Ultrastrong Magnetic Field? |
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Authors: | Q Z Liu J Z Yan X D Li H R Hang |
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Institution: | (1) Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing, 210008, China;(2) Service d’Astrophysique / CEA-Saclay, 91191 Gif-sur-Yvette, France;(3) Department of Astronomy, Nanjing University, Nanjing, 210008, China |
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Abstract: | We investigate the nature of the pulsar of the Be/X-ray binary, AX J0051-733. Although the system has a very short orbital period, it meets the basic definition of Be/X-ray binaries. We argue that, in order to interpret such a short orbital period, the initial magnetic field strength of the pulsar must be between 4.2×1013–5×1015 G, if typical values of the parameters chosen. Thus, the pulsar was most likely born as a magnetar. We further suggest that magnetar descendants can also be found among the massive X-ray binaries with extremely short-orbit periods, in addition to among the X-ray binaries with very long pulse periods. |
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Keywords: | Binaries Close– pulsars Individual AX J0051-733– stars Neutron star– X-rays Stars– stars Emission-line Be |
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