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Paper: Molecular Line Observations of Proto-planetary Nebulae
Volume: 199, Asymmetrical Planetary Nebulae II: From Origins to Microstructures
Page: 347
Authors: Alcolea, J.; Bujarrabal, V.; Castro-Carrizo, A.; Sánchez Contreras, C.; Neri, R.; Zweigle, J.
Abstract: 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: M 1-92, M 2-56 and OH 231.8+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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