Insight into the OH polarimetric structure of OH 26.5+0.6

Abstract

We present the first view of the magnetic field structure in the OH shell of the extreme OH/IR star OH 26.5+0.6. MERLIN interferometric observations of this object were obtained in December 1993 in full polarisation, at 1612, 1665 and 1667 MHz. The maser spots show a spheroidal distribution both at 1612 and 1667 MHz, while at 1665 MHz emission from the blue-shifted maser peak is concentrated on the stellar position, and the red-shifted peak emission exhibits a filamentary structure oriented on a SE-NW axis. The linear polarisation in both main lines is rather faint, ranging from 9 to 20% at 1665 MHz and from 0 to 30% at 1667 MHz. At 1612 MHz most maser spots exhibit a similar range of linear polarisation although those in the outermost parts of the envelope reach values as high as 66%. This is particularly apparent in the southern part of the shell. The detailed distribution of the polarisation vectors could only be obtained at 1612 MHz. The polarisation vectors show a highly structured distribution indicative of a poloidal magnetic field inclined by 40-60${}^{\circ }$ 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${}^{\circ }$ to the line of sight.

20 pages, 16 figures, accepted for publication in MNRAS

References in corpus (5)

• Isolated vs. Common Envelope Dynamos in Planetary Nebula Progenitors
• New pulsar rotation measures and the Galactic magnetic field
• Multi-epoch imaging polarimetry of the SiO masers in the extended atmosphere of the Mira variable TX Cam
• Intrinsic properties of the magnetically collimated water maser jet of W43A
• Pumping of OH Main-Line Masers in Star-Forming Regions

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