Magnetic fields around late-type stars using water maser observations

Details Magnetic fields around late-type stars using water maser observations Magnetic fields around late-type stars using water maser observations

2005-07-11

arxiv.org/abs/astro-ph/0507258v1

Astronomy and Astrophysics

Astrophysics

to appear in the porceedings of the "Stellar End Products" workshop, 13-15 April 2005, Granada, Spain (for publication in MmSA

Scientific paper

We present the analysis of the circular polarization, due to Zeeman splitting, of the water masers around a sample of late-type stars to determine the magnetic fields in their circumstellar envelopes. The magnetic field strengths in the water maser regions around the Mira variable stars U Ori and U Her are shown to be several Gauss while those of the supergiants S Per, NML Cyg and VY CMa are several hundred mG. We also show that large scale magnetic fields permeate the CSE of an evolved star; the polarization of the water masers around VX Sgr reveals a dipole field structure. We shortly discuss the coupling of the magnetic field with the stellar outflow, as such fields could possibly be the cause of distinctly aspherical mass-loss and the resulting aspherical planetary nebulae.

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