Journal Article

Insight into the OH polarimetric structure of OH 26.5+0.6

S. Etoka and P. J. Diamond

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 406, issue 4, pages 2218-2234
Published in print August 2010 | ISSN: 0035-8711
Published online August 2010 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2010.16840.x
Insight into the OH polarimetric structure of OH 26.5+0.6

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We present the first view of the magnetic field structure in the OH shell of the extreme OH/infrared star OH 26.5+0.6. Multi-Element Radio-Linked Interferometer Network (MERLIN) interferometric observations of this object were obtained in 1993 December in full polarization, at 1612, 1665 and 1667 MHz. The maser spots show a spheroidal distribution at both 1612 and 1667 MHz, while at 1665 MHz emission from the blueshifted maser peak is concentrated on the stellar position and the redshifted peak emission exhibits a filamentary structure oriented on a south-east–north-west axis. The linear polarization in both main lines is rather faint, ranging from 9 to 20 per cent at 1665 MHz and from 0 to 30 per cent at 1667 MHz. At 1612 MHz, most maser spots exhibit a similar range of linear polarization although those in the outermost parts of the envelope reach values as high as 66 per cent. This is particularly apparent in the southern part of the shell. The detailed distribution of the polarization vectors could only be obtained at 1612 MHz. The polarization vectors show a highly structured distribution indicative of a poloidal magnetic field inclined by 40°–60° to the line of sight. The velocity distribution of the maser spots with respect to the radial distance is well explained by an isotropic outflow at constant velocity in the case of a prolate-shaped spheroid envelope, also tilted about 45°–65° to the line of sight.

Keywords: magnetic fields; masers; polarization; stars: AGB and post-AGB; stars: individual: OH 26.5+0.6

Journal Article.  6980 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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