Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-03-13
Mon.Not.Roy.Astron.Soc.369:189-196,2006
Astronomy and Astrophysics
Astrophysics
11 pages, LaTeX (mn2e.cls), incl. 9 PostScript (ps or eps) figures and 2 tables. Accepted by MNRAS
Scientific paper
10.1111/j.1365-2966.2006.10279.x
We present radio observations of the unique, recently formed, planetary nebula (PN) associated with a very long-period OH/IR variable star V1018 Sco that is unequivocally still in its asymptoticgiant branch phase. Two regions within the optical nebula are clearly detected in nonthermal radio continuum emission, with radio spectral indices comparable to those seen in colliding-wind Wolf-Rayet binaries. We suggest that these represent shocked interactions between the hot, fast stellar wind and the cold nebular shell that represents the PN's slow wind moving away from the central star. This same interface produces both synchrotron radio continuum and the optical PN emission. The fast wind is neither spherical in geometry nor aligned withany obvious optical or radio axis. We also report the detection of transient H2O maser emission in this nebula.
Chapman Jessica M.
Cohen Martin
Deacon Rachel M.
Green Anne J.
Parker Quentin A.
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