Volume 527, March 2011
|Number of page(s)||5|
|Published online||08 February 2011|
Photospheric Hanle diagnostic of weak magnetic dipoles in stars
THEMIS – CNRS UPS 853,
C/ vía Láctea s/n,
2 Instituto de Astrofísica de Canarias, C/ vía Láctea s/n, 38200 La Laguna, Tenerife, Spain
3 Departamento de Física, Ingeniería de Sistemas y Teoría de la Señal, Universidad de Alicante, Apdo. 99, 03080 Alicante, Spain
Received: 13 July 2010
Accepted: 23 November 2010
Aims. We propose and explore a new diagnostic 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
Methods. A star with a simple dipolar field and a 1–0 spectral line were used to compute polarization amplitudes and angles.
Results. Predicted amplitudes are low but within reach of present instruments
Conclusions. A new application of the Hanle effect is proposed and analyzed as a tool that allows measuring of some of the weakest stellar magnetic fields.
Key words: techniques: polarimetric / techniques: spectroscopic / methods: observational / stars: magnetic field
© ESO, 2011
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