Magnetic fields during post-AGB evolution

Details Magnetic fields during post-AGB evolution Magnetic fields during post-AGB evolution

Oct 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006atnf.prop..440v&link_type=abstract

ATNF proposal C1603, Semester: October, 2006

Computer Science

Stellar, Galactic, Atca

Scientific paper

We propose to take sensitive 12-mm ATCA observations of four post-AGB stars and measure circular polarisation in the water maser emission at 22 GHz. The Zeeman effect at 22 GHz is very weak but if detected, provides a measurement of the magnetic fields through Zeeman splitting. For one post-AGB star, W43A, the water masers are found to be in a high-velocity jet which appears to be magnetically collimated. We propose to look for polarisation from a larger sample of stars to further investigate whether jets and outflows from post-AGB stars are shaped by the magnetic fields. This experiment would also provide an interesting test of the 12-mm polarisation capabilities of the Compact Array.

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