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- W2007183295 abstract "Her X-1 has been observed in the 13-180 keV energy range by the HEAO 1 A-4 Low-Energy Detectors during selected phases of the 35 d on-off cycle. During a pointing observation in September 1978, the pulse profile was observed to change continuously from its normal shape to an anomalous double-pulsed form. Moreover, at this time the main-on state, normally of the duration 10 d, was seen to terminate after only 7 d. Since such an anomalous pulse profile has also been reported by Truemper et al. in 1986 during a short-on state, three short-on states in the HEAO 1 data were also investigated. One short-on observation had the sensitivity to detect pulsing, and the observed profile also had an anomalous double-pulsed form. Current models for the 35 d cycle of Her X-1 have been examined, and a model with a neutron star undergoing free precession could not explain the sudden change of pulse profile within 20 hr at the end of a main-on state." @default.
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- W2007183295 date "1987-08-01" @default.
- W2007183295 modified "2023-09-25" @default.
- W2007183295 title "A rapid change of the Hercules X-1 pulse profile and high-state duration" @default.
- W2007183295 doi "https://doi.org/10.1086/184958" @default.
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