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Magnetic fields in AGB stars and (proto-) Planetary Nebulae

Published online by Cambridge University Press:  01 November 2008

Fabrice Herpin ,
A. Baudy ,
E. Josselin ,
C. Thum  and
H. Wiesemeyer
Fabrice Herpin
Affiliation:
Université de Bordeaux, Lab. d'Astrophysique de Bordeaux, F-33000 Bordeaux, France email: [email protected] CNRS/INSU, UMR 5804, BP 89, 33271 FLOIRAC cedex, France
A. Baudy
Affiliation:
Université de Bordeaux, Lab. d'Astrophysique de Bordeaux, F-33000 Bordeaux, France email: [email protected] CNRS/INSU, UMR 5804, BP 89, 33271 FLOIRAC cedex, France
E. Josselin
Affiliation:
GRAAL, Université Montpellier II - ISTEEM, CNRS, Place Eugène Bataillon, F-34095 Montpellier Cedex, France
C. Thum
Affiliation:
Institut de Radio Astronomie Millimétrique, 300 rue de la Piscine, F-38406 Saint Martin d'Hères, France
H. Wiesemeyer
Affiliation:
Institut de Radio Astronomie Millimétrique, 300 rue de la Piscine, F-38406 Saint Martin d'Hères, France
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Abstract

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During its quick transition to the Planetary Nebula stage, the Asymptotic Giant Branch star will completely change its geometry. This AGB stellar evolution stage is characterized by a high mass loss driven by the radiation pressure. Strong magnetic field may rule the mass loss geometry and the global shaping of these objects. Following our previous work on the polarization of the SiO maser emission in a representative sample of O-rich evolved stars, we present here a study towards C-rich objects and PPN/PN objects to obtain unbiased conclusions. Using Xpol at the IRAM-30 m telescope, we have conducted CN N=1-0 observations to investigate the Zeeman effect in this molecule and draw conclusion on the evolution of the magnetic field and its influence during the transition of an AGB star to the PN stage. Following the analysis described by Crutcher et al. (1996) we derive an estimate of the magnetic field.

Keywords

Magnetic field – stars: evolution – radio lines: stars – ISM: molecules
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Symposium S259: Cosmic Magnetic Fields: From Planets, to Stars and Galaxies , November 2008 , pp. 47 - 52
Copyright
Copyright © International Astronomical Union 2009

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