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Interstellar polarization at high galactic latitudes from distant stars
II. Evidence for depolarization starting at
Received 9 May 1996 / Accepted 22 May 1996
We have measured linear polarization for 20 distant high latitude A and F stars, as a first step to extend our previous study (Berdyugin et al. 1995: Paper I) of the North Galactic polar cap to distances larger than 600 pc. The results give tentative evidence for depolarization starting to be seen around pc, possibly indicating that there is a significant change in the magnetic field direction. Depolarization requires that there is still light-polarizing dust in the Z range 500-1000 pc and the lower limit to extinction inferred in Paper I ( mag) must be increased by a yet undetermined amount.
Key words: polarization dust, extinction solar neighbourhood
Send offprint requests to: P. Teerikorpi
Online publication: July 8, 1998