The recent pulse period evolution of SMC X-1

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dc.creatorKahabka, P.
dc.creatorLi, X. -D.
dc.date1999-02-09
dc.date.accessioned2026-07-07T02:30:23Z
dc.date.available2026-07-07T02:30:23Z
dc.descriptionWe report observations of SMC X-1 in three new high-intensity states with ROSAT HRI in December 1995, May 1997, and March 1998 in which pulsations with a period of 0.70769+/-0.00006 sec, 0.70706+/-0.00001 sec, and 0.706707+/-0.00001 sec respectively were detected. Combining the pulse periods from observations with ROSAT PSPC in high-intensity states in October 1991 and March 1998, respectively, we obtain the spin-up rate of the pulsar in recent 6.5 years, -dP/dt = 1.18+/-0.06 10^-11 s s^-1, consistent with the average spin-up rate -dP/dt = 1.2 10^-11 s s^-1 determined from previous measurements indicating that the stable spin-up has continued. Pulsations with a period of 0.709103+/-0.000003 sec were also detected ~2 weeks after an X-ray turn-off during an X-ray low-intensity state in October 1991, and the period derivative derived within ~10 days is -dP/dt ~ (1.1+/-0.7) 10^-11 s s^-1. This is consistent with a constant accretion torque in sign and magnitude. The magnitude of the magnetic moment of the pulsar is discussed based on different description of the apparent spin-up behavior.
dc.description4 pages, accepted by A&A February 9th 1999
dc.identifierhttps://arxiv.org/abs/astro-ph/9902139
dc.identifierhttp://arxiv.org/abs/astro-ph/9902139
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/13797
dc.subjectAstrophysics
dc.titleThe recent pulse period evolution of SMC X-1
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