Detection of ultra-weak magnetic fields in Am stars: beta UMa and theta Leo

• Main Authors: Blazère, A., Petit, P., Lignières, F., Aurière, M., ballot, J., Böhm, T., Folsom, C. P., Gaurat, M., Jouve, L., Ariste, A. Lopez, Neiner, C., Wade, G. A.
• Format: Text
• Language: unknown
• Published: arXiv 2016
• Subjects: Solar and Stellar Astrophysics astro-ph.SR; FOS Physical sciences; Sirius; narval
• Online Access: https://dx.doi.org/10.48550/arxiv.1601.01829; https://arxiv.org/abs/1601.01829

An extremely weak circularly polarized signature was recently discovered in spectral lines of the chemically peculiar Am star Sirius A. A weak surface magnetic field was proposed to account for the observed polarized signal, but the shape of the phase-averaged signature, dominated by a prominent pos...