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Modelling of the Magnetic Configuration of CP Stars from Polarimetric Observations

Published online by Cambridge University Press:  14 August 2015

M. Landolfi
M. Landolfi*
Affiliation:
Osservatorio di Arcetri1-50125 Firenze, Italia

Extract

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The observational quantities commonly used to study the magnetic field of CP stars – the mean field modulus and the mean longitudinal field, as well as the ‘mean asymmetry of the longitudinal field’ and the ‘mean quadratic field’ recently introduced by Mathys (1995a,b) – are based either on the Stokes parameter / or on the Stokes parameter V. However, a complete description of polarized radiation requires the knowledge of the full Stokes vector: in other words, we should expect that useful information is also contained in linear polarization (the Stokes parameters Q and U); or rather we should expect the information contained in (Q, U) and in V to be complementary, since linear and circular polarization are basically related to the transverse and the longitudinal component of the magnetic field, respectively.

Type
II. Joint Discussions
Information
Highlights of Astronomy , Volume 11 , Issue 2: Highlights of Astronomy. As presented at the XXIIIrd General Assembly of the IAU (Part B), 1997 , 1998 , pp. 679 - 681
Copyright
Copyright © Kluwer 1998

References

Bagnulo, S., Landi Degl’Innocenti, E., Landolfi, M. and Leroy, J.L. (1995) Linear polarimetry of Ap stars III. A diagnostic method for the magnetic structure of rotating stars, Astron. Astrophys. 295, pp. 459–470 Google Scholar
Borra, E.F. and Vaughan, A.H. (1976) Observations of the transverse Zeeman effect in the magnetic star Beta Coronae Borealis: Evidence for the oblique rotator model, Astrophys. J. 210, pp. L145–L147 Google Scholar
Kemp, J.C. and Wolstencroft, R.D. (1974) The intrinsic linear polarization of 53 Camelopardalis and α1 Canum Venaticorum, Mon. Not. Roy. Astron. Soc. 166, pp. 1–18 Google Scholar
Landolfi, M., Landi Degl’Innocenti, E., Landi Degl’Innocenti, M. and Leroy, J.L. (1993) Linear polarimetry of Ap stars I. A simple canonical model, Astron. Astrophys. 272, pp. 285–298 Google Scholar
Landolfi, M-, Bagnulo, S., Landi Degl’Innocenti, M., Landi Degl’Innocenti, E. and Leroy, J.L. (1997) Constraints on the magnetic configuration of Ap stars from simple features of observed quantities, Astron. Astrophys. 322, pp. 197–201 Google Scholar
Leroy, J.L. (1962) Contributions a l’étude de la polarisation de la lumière solaire, Ann. Astrophys. 25, pp. 127–164 Google Scholar
Leroy, J.L. (1995) Linear polarimetry of Ap stars V. A general catalogue of measurements, Astron. Astrophys. Suppl. 114, pp. 79–104 Google Scholar
Leroy, J.L., Landolfi, M. and Landi Degl’Innocenti, E. (1996) Linear polarimetry of Ap stars VI. A modified dipolar model consistent with the observations, Astron. Astrophys. 311, pp. 513–522 Google Scholar
Mathys, G. (1995a) Spectropolarimetry of magnetic stars IV. The crossover effect, Astron. Astrophys. 293, pp. 733–745 Google Scholar
Mathys, G. (1995b) Spectropolarimetry of magnetic stars V. The mean quadratic magnetic field, Astron. Astrophys. 293, pp. 746–763 Google Scholar
Piirola, V. and Tuominen, I. (1981) The intrinsic linear polarization of the magnetic variable HD 71866, in: CP stars of the upper main sequence, 23rd International Conference on Astrophysics, Liège, Université de Liège, pp. 283–288 Google Scholar