XRISM observations reveal orbital-phase-dependent variability in highly ionized iron absorption lines and tentative short-term changes on few-second timescales in Cygnus X-1, indicating structural variations in the stellar wind.
P., Gabler, R., Vilchez, J
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XRISM High-Resolution X-ray Spectroscopy of Cygnus X-1 -- Orbital and Short-Term Variability of Iron Absorption
XRISM observations reveal orbital-phase-dependent variability in highly ionized iron absorption lines and tentative short-term changes on few-second timescales in Cygnus X-1, indicating structural variations in the stellar wind.