MERLIN observations of OH/IR stars
Paper in proceedings, 2008

We present MERLIN OH 1612 MHz observations towards 3 OH/IR stars, OH15.7+0.8, OH38.3+1.9 and IRAS 19319+2214. The main objective of the project is to investigate if their complicated OH 1612 MHz spectral properties can be related to the phenomenon of highly time-variable mass loss found towards a handful of carbon stars, where detached shells with an overall spherical symmetry are present. Despite extensive searches, no oxygen-rich star with such a shell has been found in any molecular emission. Based on the MERLIN data however, we find that the circumstellar structure of the three OH/IR stars appears to be more complicated than that of detached shells. Signs of bipolarity in the outflows of OH38.3+1.9 and IRAS 19319+2214 could indicate that these are early post-AGB objects.

Author

Michael Lindqvist

Onsala Space Observatory

Fredrik Schöier

Onsala Space Observatory, Observation Support

Hans Olofsson

Onsala Space Observatory

A.M.S. Richards

University of Manchester

Proceedings of Science

18248039 (eISSN)

Vol. 72 081

9th European VLBI Network Symposium on The role of VLBI in the Golden Age for Radio Astronomy and EVN Users Meeting, EVN Symposium 2008
Bologna, Italy,

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Meteorology and Atmospheric Sciences

Astronomy, Astrophysics and Cosmology

Other Earth and Related Environmental Sciences

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Onsala Space Observatory

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3/10/2020