The structure of the Proto-Planetary Nebula OH 231.8+4.2 as revealed by VLTI and MERLIN interferometric observations

Sandra Etoka
2009 Proceedings of The 9th European VLBI Network Symposium on The role of VLBI in the Golden Age for Radio Astronomy and EVN Users Meeting — PoS(IX EVN Symposium)   unpublished
We present recent interferometric observations made with the VLTI/MIDI intrument and MER-LIN towards OH 231.8+4.2 allowing us to investigate the circumstellar material morphology from very near to the central object to far out where the OH masers are found. The VLTI observations revealed that the shape of the central core is not the same at 8 and 13 µm, possibly due to emission from the dust being heated by the hot companion. The MERLIN observations in the 1667-MHz OH maser line revealed a
more » ... organised magnetic field embedded in the outflow, possibly originating from the compact core suggested by the VLT/VLTI infrared observations. A correlation between the geometric structure and the magnetic field orientation is found. A tentative model of the overall geometric and magnetic structure of the circumstellar material surrounding OH 231.8+4.2 that takes into account all the dynamical and physical characteristics inferred from both the mid-infrared and OH maser results is presented.
doi:10.22323/1.072.0063 fatcat:tfyl6z2ywbdvvdt3ok4crthpr4