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- W3100939573 abstract "We report a spectropolarimetric study of the post-AGB binary system 89 Herculis, based on data acquired with the high-resolution Catania Astrophysical Observatory Spectropolarimeter, the HArps-North POlarimeter and the Echelle SpectroPolarimetric Device for the Observation of Stars. The linear polarization clearly detected across single atmospheric lines in absorption is characterized by complex Q and U morphologies that are variable with the orbital period of the system. Gauss-level magnetic fields, continuum depolarization due to pulsations, hot spots and scattering in the circumstellar environment were excluded as possible origin of the observed polarization. In the context of the optical pumping mechanism, we suggest that the anisotropy of the stellar radiation field, fuelled by the close binary companion, can be responsible of the observed periodic properties of the spectral line polarization. We conclude that high resolution linear spectropolarimetry could be an important diagnostic tool in the study of aspherical envelopes of cool and evolved stars." @default.
- W3100939573 created "2020-11-23" @default.
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- W3100939573 date "2019-08-01" @default.
- W3100939573 modified "2023-09-26" @default.
- W3100939573 title "The Second Solar Spectrum of the post-AGB binary 89 Herculis" @default.
- W3100939573 hasPublicationYear "2019" @default.
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