Photospheric Hanle diagnostic of weak magnetic dipoles in stars

Details Photospheric Hanle diagnostic of weak magnetic dipoles in stars Photospheric Hanle diagnostic of weak magnetic dipoles in stars

2010-11-29

arxiv.org/abs/1011.6288v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

6 pages, 3 figures. Accepted for publication in A&A

Scientific paper

Diagnostic techniques for stellar magnetic fields based upon spectropolarimetry. We propose and explore a new technique based upon the linear polarization emitted in Hanle-sensitive lines in disk-integrated stars where a dipolar magnetic field breaks the rotational symmetry of the resonance scattering polarization. A star with a simple dipolar field and a 1-0 spectral line are used to compute polarization amplitudes and angles.Predicted amplitudes are low but within reach of present instruments. A new application of the Hanle effect is proposed and analyzed, a tool that allows measuring of some of the weakest stellar magnetic fields.

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