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astro-ph1999
Measurements of 12C/13C ratio in planetary nebulae: implications on stellar and Galactic chemical evolution
F. Palla, R. Bachiller, L. Stanghellini +2
We present the results of a study aimed at determining the 12C/13C ratio in two samples of planetary nebulae (PNe) by means of millimeter wave observations of 12CO and 13CO. The fi…
astro-ph1999
Molecular Outflows from Young Stellar Objects
John Richer, Debra Shepherd, Sylvie Cabrit +2
We review some aspects of the bipolar molecular outflow phenomenon. In particular, we compare the morphological properties, energetics and velocity structures of outflows from high…