Bibcode
                                    
                            Phillips, J. P.; Mampaso, A.
    Bibliographical reference
                                    Astronomy and Astrophysics (ISSN 0004-6361), vol. 218, no. 1-2, July 1989, p. 257-263. Research supported by CAICYT and SERC.
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                        7
            
                        1989
            
  Citations
                                    6
                            Refereed citations
                                    6
                            Description
                                    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.