Chemical Timescale of Dark Cloud Cores Estimated from Deuterium Fractionation
Chemical Timescale of Dark Cloud Cores Estimated from Deuterium Fractionation
复制标题
通过氘分馏估算的暗云核心的化学时标
DOI：
10.1086/339474
复制
发表时间：
2002
期刊：
影响因子：
--
通讯作者：
N. Kaifu
中科院分区：
文献类型：
--
作者：
S. Saito;Y. Aikawa;E. Herbst;M. Ohishi;T. Hirota;S. Yamamoto;N. Kaifu
在假定所用的化学模型合理的情况下，根据氘分馏程度估算了暗云核的化学演化年龄。利用DCO+和H13 CO+的丰度比，结合新的气相化学反应标准模型网络，将该方法应用于TMC-1脊沿着的暗云芯。氨峰和氰基多炔峰之间氘分馏的差异，虽然从观测数据传递的误差较大，但可以用演化年龄大于105年的时间差或碳氧贫化因子的微小变化来解释，这也反映了核的演化程度。确定暗云核演化年龄的方法在某种程度上不涉及与氘分馏没有直接关系的化学反应细节。并与其它方法的结果进行了比较。
The chemical evolutionary age of dark cloud cores is estimated from the degree of deuterium fractionation, on the assumption that the chemical model used is reasonable. The method is applied to dark cloud cores along the TMC-1 ridge, using the abundance ratios between DCO+ and H13CO+ combined with the new standard model network of gas-phase chemical reactions. The difference in deuterium fractionation between the ammonia peak and the cyanopolyyne peak, though its error transferred from the observed data is relatively large, is explained by a time difference in the evolutionary age of more than 105 yr, or by a small change in the depletion factor of carbon and oxygen, which also indicates the degree of core evolution. The method of determining the evolutionary age of dark cloud cores is somewhat free from the details of chemical reaction not directly related to deuterium fractionation. The present result is compared with those from other methods.
DOI：
10.1086/376970
发表时间：
2001-02
期刊：
The Astrophysical Journal
影响因子：
--
作者：
T. Hirota;Masafumi Ikeda;S. Yamamoto
通讯作者：
T. Hirota;Masafumi Ikeda;S. Yamamoto