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- W3100528246 abstract "An extremely weak circularly-polarized signature was recently discovered in spectral lines of the chemically peculiar Am star Sirius A (Petit et al. 2011). This signal was interpreted as a Zeeman signature related to a sub-gauss longitudinal magnetic field, constituting the first detection of a surface magnetic field in an Am star. We present here ultra-deep spectropolarimetric observations of two other bright Am stars, $beta$ UMa and $theta$ Leo, observed with the NARVAL spectropolarimeter. The line profiles of the two stars display circularly-polarized signatures similar in shape to the observations gathered for Sirius A. These new detections suggest that very weak magnetic fields may be present in the photospheres of a significant fraction of intermediate-mass stars, although the strongly asymmetric Zeeman signatures measured so far in Am stars (featuring a prominent positive lobe and no detected negative lobe) are not expected in the standard theory of the Zeeman effect." @default.
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- W3100528246 date "2014-12-01" @default.
- W3100528246 modified "2023-10-10" @default.
- W3100528246 title "Ultra-weak magnetic fields in Am stars: β UMa and θ Leo" @default.
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- W3100528246 doi "https://doi.org/10.1017/s1743921315004536" @default.
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