Photospheric Hanle diagnostic of weak magnetic dipoles in stars

Bibcode
2011A&A...527A.120L
DOI
10.1051/0004-6361/201015388
López Ariste, A.; Asensio-Ramos, A.; González Fernández, C.
Bibliographical reference

Astronomy and Astrophysics, Volume 527, id.A120

Advertised on:
3
2011
Journal
Astronomy and Astrophysics
Number of authors
3
IAC number of authors
1
Citations
13
Refereed citations
10
Description
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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Type
Refereed
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