The Zeeman Effect in Hot-Star Winds With a Split Monopole Magnetic Field
Document Type
Conference Proceeding
Publication Date
12-1-2009
Description
We calculate the circularly polarized Stokes V(λ) profile for emission lines, formed in hot-star winds threaded with a weak split monopole magnetic field. Invoking the weak-field approximation, we find that the V(λ) profile has a characteristic shape with the ubiquitous sign reversal across line center, but also with a sign reveral in each wing. For the optically thin lines treated here, we also conclude that the V(λ) profile integrates to zero on each side of the line separately. The overall scale of V(λ)/I(λ) is set by the ratio of the field strength to the flow speed, B/v, characteristic of the line-forming region, and is of the order of 0.1% for a wind magnetic field B ≅ 100 G at depths where the windspeed is v ≅ 100 km s-1.
Citation Information
Gayley, K. G.; and Ignace, R.. 2009. The Zeeman Effect in Hot-Star Winds With a Split Monopole Magnetic Field. AIP Conference Proceedings. Vol.1171 187-198. https://doi.org/10.1063/1.3250059 ISSN: 0094-243X ISBN: 9780735407107