HERPIN, Fabrice; BAUDRY, Alain; THUM, C.; WIESEMEYER, Helmut; MORRIS, D.

doi:10.1063/1.2077227

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HERPIN, Fabrice
Observatoire aquitain des sciences de l'univers [OASU]
Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
Laboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]

BAUDRY, Alain
Observatoire aquitain des sciences de l'univers [OASU]
Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
Laboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]

THUM, C.
Institut de RadioAstronomie Millimétrique [IRAM]

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Ce document a été publié dans

2005AIPC..784..613H - MAGNETIC FIELDS IN THE UNIVERSE: From Laboratory and Stars to Primordial Structures. AIP Conference Proceedings,, 2005AIPC..784..613H - MAGNETIC FIELDS IN THE UNIVERSE: From Laboratory and Stars to Primordial Structures. AIP Conference Proceedings,, MAGNETIC FIELDS IN THE UNIVERSE, 2005-09-28. 2005, vol. 784, p. 613-628

Résumé en anglais

We have measured the polarization of the SiO maser emission in a representative sample of evolved stars. We made simultaneous spectroscopic measurement of the 4 Stokes parameters, from which we derive the circular and linear polarization levels. These observations allow us to discuss the existent SiO maser models, to derive the strength of the magnetic field, and thus to determine the real influence of this magnetic field in the life of these evolved objects. The magnetic field strength we derive varies between 0 and 18 Gauss, with a mean value of 3.5 G and may follow a 1/r law throughout the circumstellar envelope. As a consequence, the magnetic field has a real influence on the life of these evolved objects: it definitively plays the role of a collimating, and more generally, of a shaping, agent in evolved objects.< Réduire

Mots clés en anglais

stellar polarimetry

astronomical masers

magnetic fields

stars

interstellar matter

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SiO maser polarization in evolved stars: magnetic field

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