Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002apj...564..379l&link_type=abstract
The Astrophysical Journal, Volume 564, Issue 1, pp. 379-384.
Astronomy and Astrophysics
Astronomy
11
Polarization, Radiative Transfer, Stars: Atmospheres
Scientific paper
We find all the sources of asymmetries in Stokes profiles available for a unidimensional line of sight. The analytical solution for the transfer equation for polarized light obtained by López Ariste & Semel is used for this purpose. Three sources of asymmetries are obtained: the first is the well-known case of depth-dependent velocity fields; the two others are due to wavelength asymmetries in the absorption matrix and the emission vector. These emission vector asymmetries can be produced by the presence of a polarized (but symmetric) source function. Some formulae are derived describing the asymmetries owing to depth-dependent velocity fields in Stokes V for the case of the Zeeman effect in a multiplet, as well as for the net area of the Stokes V profile, the so-called net circular polarization (NCP). An implication of this last formula is that Milne-Eddington atmospheric models, even when generalized to velocity and magnetic fields that vary linearly with optical depth, cannot account for the observed NCPs.
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