Astronomy and Astrophysics (ISSN 0004-6361), vol. 218, no. 1-2, July 1989, p. 257-263. Research supported by CAICYT and SERC.
Phillips, J. P.; Mampaso, A.
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Nine type I post-main-sequence nebulae were observed in CO J = 2-1 using the NRAO 12-m antenna at Kitt Peak. It is found that, at the most, 20 percent of type I sources have antenna temperatures of greater than 0.2 K. The results suggest secondary kinematic splitting of the primary emission shell, and confirm the presence of high velocity outflows distinguished by an anomalous spatiokinematic morphology.