Molecular and low excitation emission in high mass post-main-sequence nebulae

Phillips, J. P.; Williams, P. G.; Mampaso, A.; Ukita, N.
Bibliographical reference

Astrophysics and Space Science (ISSN 0004-640X), vol. 188, no. 2, Feb. 1992, p. 171-204. Research supported by DGCYT.

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A broad range of type I post-main-sequence nebulae have been mapped and studied spectroscopically in the J = 1 - 0, J = 2 - 1, and J = 3 - 2 transitions of CO using the 12-m antenna at Kitt Peak and the 45-m facility at the Nobeyama Radio Observatory. CO J = 2 - 1 emission associated with NGC 3132 and NGC 6445 is detected; the location of CO J = 1 - 0 emission in the nucleus of NGC 6302 is determined, and CO J = 3 - 2 spectroscopy is obtained for the first time for a substantial cross section of type I sources. The nature of the emission is assessed, and its correlation with H2S(1) and optical shock indicators and the underlying processes responsible for the observed trends are discussed.