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- W2341179976 abstract "LMC X-4 is an eclipsing high-mass X-ray binary exhibiting a superorbital modulation with a period of ∼ 30.5 days. We present a detailed study of the variations of the superorbital modulation period with a time baseline of ∼ 18 years. The period determined in the light curve collected by the Monitor of All-sky X-ray Image (MAXI) significantly deviates from that observed by the All Sky Monitor (ASM) onboard the Rossi X-ray Timing Explorer (RXTE). Using the data collected by RXTE/ASM, MAXI, and the Burst Alert Telescope (BAT) onboard Swift, we found a significant period derivative, Ṗ = (2.08± 0.12)× 10−5. Furthermore, the O–C residual shows complex short-term variations indicating that the superorbital modulation of LMC X-4 exhibits complicated unstable behaviors. In addition, we used archive data collected by the Proportional Counter Array (PCA) on RXTE to estimate the orbital and spin parameters. The detected pulse frequencies obtained in small time segments were fitted with a circular orbital Doppler shift model. In addition to orbital parameters and spin frequency for each observation, we found a spin frequency derivative of ν = (6.482 ± 0.011) × 10−13 Hz · s−1. More precise orbital and spin parameters will be evaluated by the pulse arrival time delay technique in the future." @default.
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- W2341179976 date "2015-09-01" @default.
- W2341179976 modified "2023-09-22" @default.
- W2341179976 title "On the Complex Variability of the Superorbital Modulation Period of LMC X-4" @default.
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