Astronomy and Astrophysics – Astronomy
Scientific paper
Jul 1999
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999apj...520..335i&link_type=abstract
The Astrophysical Journal, Volume 520, Issue 1, pp. 335-346.
Astronomy and Astrophysics
Astronomy
14
Line: Formation, Polarization, Scattering, Stars: Atmospheres, Stars: Magnetic Fields
Scientific paper
A magnetic field diagnostic of stellar winds that uses the Hanle effect is discussed. This diagnostic pertains to the modification of resonance-line-scattering polarization in the presence of magnetic fields. The case for resolved polarized profiles of optically thin emission lines is considered, and some analytic results for an expanding equatorial disk are derived. Numerical results for a dipole magnetic field embedded in a spherical outflow are also presented. Although the considerations are somewhat simplified, the primary conclusion is that the modification or creation of line profile polarization by the Hanle effect can be used to discriminate between different magnetic field geometries and to estimate the magnetic field strength in the region of line formation.
Cassinelli Joe P.
Ignace Richard
Nordsieck Kenneth H.
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