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Detecting the Zeeman effect in Massive Star Magnetospheres in the UV
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abstract
Approximately 7% of massive stars host stable surface magnetic fields that are strong enough to alter stellar evolution through their effect on the stellar wind. It is therefore crucial to characterize the strength and structure of these large-scale fields in order to quantify their influence on massive star evolution. This is traditionally done by measuring the circular polarization caused by Zeeman splitting in optical photospheric lines, but we investigate here the possibility of detecting Stokes $V$ signatures in the wind-sensitive resonance lines formed in magnetically confined winds in the high opacity ultraviolet (UV) domain. This unique diagnostic would be accessible to high-sensitivity spaceborne UV spectropolarimeters such as POLSTAR.
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Cited by 1 Pith paper
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Pollux UV & FUV polarimeters: first lab results
First laboratory results from the Pollux UV test bench demonstrate working polarization generation, a first end-to-end polarimetric measurement, and a far-UV analyser with extinction ratio 10 at 120 nm.
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