XRISM/Resolve high-resolution spectroscopy detects coherent orbital modulation in Fe XXV Kα line centroids from EX Hydrae, yielding K1 = 58.1 km/s and a white dwarf mass of 0.79 solar masses consistent with optical tracers.
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Experimental determination of the Kα resonance energy in Be-like oxygen at 554.372(3) eV with resolved 2.2 meV isotopic shift between 16O and 18O.
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Tracing the Orbital Motion of the Accreting White Dwarf in EX~Hydrae with XRISM/Resolve
XRISM/Resolve high-resolution spectroscopy detects coherent orbital modulation in Fe XXV Kα line centroids from EX Hydrae, yielding K1 = 58.1 km/s and a white dwarf mass of 0.79 solar masses consistent with optical tracers.