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A Simple Mean-Field Diagnostic from Stokes V Spectra

Published online by Cambridge University Press:  23 January 2015

K. G. Gayley  and
S. P. Owocki
K. G. Gayley
Affiliation:
University of Iowa email: kenneth-gayley@uiowa.edu
S. P. Owocki
Affiliation:
University of Delaware
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Abstract

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It is shown that the diagnostics from an observed circularly polarized line in a rapidly rotating star are directly interpretable, not in terms of the observed Stokes V profiles, but in terms of its antiderivative with respect to wavelength (in velocity units if preferred). This also leads to a new mean-field diagnostic that is just as easily obtained as the standard “center of gravity” approach, and is less susceptible to cancellation if the line-of-sight field changes sign over the face of the star.

Keywords

line:profilesmagnetic fieldstechniques: polarimetric
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Issue S307: New windows on massive stars: asteroseismology, interferometry, and spectropolarimetry , June 2014 , pp. 375 - 376
Copyright
Copyright © International Astronomical Union 2015 

References

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