Abstract
Abstract We observed four ``water fountain'' sources in the CO $ J$$ =$ 3$ \rightarrow$ 2 line emission with the Atacama Submillimeter Telescope Experiment (ASTE) 10 m telescope in 2010–2011. The water fountain sources are evolved stars that form high-velocity collimated jets traced by H$ _{2}$ O maser emission. The CO line was detected only from IRAS 16342$-$ 3814. The present work confirmed that the $ ^{12}$ CO to $ ^{13}$ CO line intensity ratio is $ \sim$ 1.5 at the systemic velocity. We discuss the origins of the very low $ ^{12}$ CO-to-$ ^{13}$ CO intensity ratio, as possible evidence for ``hot-bottom burning'' in an oxygen-rich star, and the CO intensity variation in IRAS 16342$-$ 3814.
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