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Stellar magnetic fields from four Stokes parameter observations

Published online by Cambridge University Press:  23 January 2015

N. Rusomarov ,
O. Kochukhov  and
N. Piskunov
N. Rusomarov
Affiliation:
Uppsala University email: naum.rusomarov@physics.uu.se
O. Kochukhov
Affiliation:
Uppsala University email: naum.rusomarov@physics.uu.se
N. Piskunov
Affiliation:
Uppsala University email: naum.rusomarov@physics.uu.se
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Abstract

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Magnetic Doppler imaging (MDI) from observations of four Stokes parameters can uncover new information that is of interest to the evolution and structure of magnetic fields of intermediate and high-mass stars. Our MDI study of the chemically peculiar star HD 24712 from four Stokes parameter observations, obtained with the HARPSpol instrument at the 3.6-m ESO telescope, revealed a magnetic field with strong dipolar component and weak small-scale contributions. This finding gives evidence for the hypothesis that old Ap stars have predominantly dipolar magnetic fields.

Keywords

stars: magnetic fieldsstars: atmospheresstars: chemically peculiarstars: imaging
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. 395 - 396
Copyright
Copyright © International Astronomical Union 2015 

References

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Rusomarov, N., Kochukhov, O., Piskunov, N., et al. 2013, A&A 558, A8Google Scholar
Silvester, J., Kochukhov, O., & Wade, G. A. 2014, MNRAS 440, 182Google Scholar