| Issue |
A&A
Volume 527, March 2011
|
|
|---|---|---|
| Article Number | A120 | |
| Number of page(s) | 5 | |
| Section | Stellar atmospheres | |
| DOI | https://doi.org/10.1051/0004-6361/201015388 | |
| Published online | 08 February 2011 | |
Photospheric Hanle diagnostic of weak magnetic dipoles in stars
1
THEMIS – CNRS UPS 853,
C/ vía Láctea s/n,
38200
La Laguna,
Spain
e-mail: Arturo.Lopez@themis.iac.es
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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