Journal
ASTRONOMY & ASTROPHYSICS
Volume 527, Issue -, Pages -Publisher
EDP SCIENCES S A
DOI: 10.1051/0004-6361/201015388
Keywords
techniques: polarimetric; techniques: spectroscopic; methods: observational; stars: magnetic field
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Funding
- Consolider-GTC project [CSD2006-00070]
- Spanish Ministerio de Ciencia e Innovacion (MICINN) [AYA2007-63881, AYA2008-06166-C03-03]
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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.
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