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Multi-line techniques for inference of stellar magnetic fields

Published online by Cambridge University Press:  24 July 2015

Oleg Kochukhov
Oleg Kochukhov*
Affiliation:
Department of Physics and Astronomy, Uppsala University, Uppsala 75120, Sweden email: [email protected]
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Abstract

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Spectropolarimetric studies of stellar magnetic fields usually deal with extremely weak line polarisation signatures. The amplitudes of Stokes signals, even in magnetically sensitive spectral lines, are often well below the noise level realistically achievable with the current instrumentation. Consequently, a detection of these polarisation signatures and their meaningful analysis is impossible without combining information from multiple spectral lines. Here I review basic theoretical foundations of the multi-line spectropolarimetric diagnostic methods employed in stellar magnetometry, give examples of their application, and discuss recent efforts to interpret mean polarisation profiles with the help of detailed radiative transfer calculations.

Keywords

Polarisationradiative transferstars: activitystars: magnetic fields
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 10 , Symposium S305: Polarimetry: From the Sun to Stars and Stellar Environments , December 2014 , pp. 216 - 224
Copyright
Copyright © International Astronomical Union 2015 

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