The Fe Kα line in Cen X-3 shows a sinusoidal orbital radial-velocity modulation with amplitude 248±13 km/s, inconsistent with a neutron-star-surface origin.
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Detection of the orbital modulation of Fe K$\alpha$ fluorescence emission in Centaurus X-3 using the high-resolution spectrometer Resolve onboard XRISM
The Fe Kα line in Cen X-3 shows a sinusoidal orbital radial-velocity modulation with amplitude 248±13 km/s, inconsistent with a neutron-star-surface origin.