Molecular line observations of proto-planetary nebulae

Details Molecular line observations of proto-planetary nebulae Molecular line observations of proto-planetary nebulae

1999-10-05

arxiv.org/abs/astro-ph/9910081v1

Astronomy and Astrophysics

Astrophysics

8 pages, LaTeX2e + 2 eps figures, it uses epsf style To appear in ``Asymmetrical Planetary Nebulae II: from Origins to Microst

Scientific paper

We present our recent results on mm-wave CO observations of proto-planetary nebulae. These include high-resolution interferometric maps of various CO lines in three well known bipolar PPNe: M1-92, M2-56 and OH231.8+4.2. The global properties of the high velocity molecular emission in post-AGB sources have been also studied, by means of high-sensitivity single dish observations of the J=1-0 and 2-1 lines of 12CO and 13CO. We discuss the implications of these results to constrain the origin of the post-AGB molecular high-velocity winds and the shaping of bipolar PPNe and PNe. In addition, we also present the results of an interferometric map of the molecular envelope around the luminous high-latitude star 89 Her, a low mass post-AGB source which is also a close binary system.

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