Observations of DNC and HN13C in Dark Cloud Cores

Details Observations of DNC and HN13C in Dark Cloud Cores Observations of DNC and HN13C in Dark Cloud Cores

Dec 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999sf99.proc..171h&link_type=abstract

Star Formation 1999, Proceedings of Star Formation 1999, held in Nagoya, Japan, June 21 - 25, 1999, Editor: T. Nakamoto, Nobeyam

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Scientific paper

We observed the DNC and HN13C lines toward more than 20 dark cloud cores and investigated a relationship between deuterium fractionation and chemical evolution of dark cloud cores. We found that the DNC/HN13C ratios in the observed cores range from 0.50 to 7.3. Especially, the DNC/HN13C ratios in "carbon-chain-producing regions" are systematically smaller by a factor of 2-10 than the other cores. We found a positive correlation between the DNC/HN13C ratio and the NH3/CCS ratio. Furthermore, we also made mapping observations of the DNC and HN13C lines toward TMC-1, and found that the DNC/HN13C ratio around the ammonia peak is larger than that of the cyanopolyyne peak. The correlation between the DNC/HN13C ratio and the NH3/CCS ratio can be explained by the difference in chemical evolutionary stages of the cores.

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