Her X-1 precession implies unpinned crustal superfluid vortices with weak mutual friction persisting for centuries.
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New XRISM observations confirm a highly broadened, pulsating Fe K line from the accretion column of Hercules X-1 that varies with pulse phase and evolves with the 35-day precession cycle.
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Theoretical Constraints on Neutron Star Superfluidity from Her X-1 Precession
Her X-1 precession implies unpinned crustal superfluid vortices with weak mutual friction persisting for centuries.
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XRISM/Resolve observations of Hercules X-1: a pulsating, highly broadened Fe K emission line from the neutron star accretion column
New XRISM observations confirm a highly broadened, pulsating Fe K line from the accretion column of Hercules X-1 that varies with pulse phase and evolves with the 35-day precession cycle.