中文摘要：

利用中国科学院紫金山天文台德令哈观测站13．7米望远镜在IRAS02232＋6138方向进行了13^CO，C^18O，HCO^＋和N2H^＋的观测．随着探针分子的激发密度从13^CO到N2H^＋逐渐增加，IRAS 02232＋6138云核的尺度从13^CO的2．40pc减小到N2H^＋的0．54pc，云核的维里质量从13^CO的2．2×10^3M⊙减小到N2H^＋的5．1×10^2M⊙．研究发现，该方向区域内存在双极分子外流．对云核的空间密度结构用幂函数n（r）αr^-α的形式进行拟合分析，得到α=2．3—1．2；随着探测密度的增加，该指数逐渐变平．分析得到，13^CO／C^18O分子丰度比值为12．4±6．9，与暗云的11．8±5．9及大质量核的9．0-15．6值一致；N2H^＋丰度是3．5±2．5×10^-10，与暗云核的1．0—5．0×10^-10和大质量核的1．2-12．8×10^-10值一致；HCO^＋丰度为0．9±0．5×10^-9，接近大质量核的1．6-2．4×10^-9值，没有发现HCO^＋丰度增长．结合IRAS数据，得到云核的光度质量比范围为37—163（L／M）⊙，由IRAS光度估计，IRAS 02232＋6138方向云核内嵌埋的大约是一颗主序O7．5星．

英文摘要：

Using the Delingha 13.7m millimeter-wave telescope, we observed 13^CO, C^18O, HCO^＋ and N2H^＋ molecular lines toward IRAS 02232＋6138. With the increase of excitation densities from 13^CO to N2H^＋, the sizes of corresponding dense cores associated with IRAS 02232±6138 vary from 2.40 to 0.54 pc and virial masses decrease from 2.2 × 10^3 to 5.1 × 10^2M⊙. A bipolar molecular outflow is found toward IRAS02232＋6138. Using a power-law function of n（r） α r^-α to fit the spatial density structure of the core, we derived power-law indices α= 2.3- 1.2. As critical densities increase from 13^CO to N2H^＋, the power-law function becomes flat gradually. The abundance ratio of 13^CO/C^18O is 12.4±6.9, which is comparable with the ratio of 11.8 ± 5.9 for dark clouds and 9.0 - 15.6 for massive cores. The abundance of N2H^＋ is 3.5 ± 2.5 × 10^-10, which is consistent with the value of 1.0 - 5.0 × 10^-10 for dense cores in dark clouds and 1.2 - 12.8 × 10^-10 for massive cores. The abundance of HCO^＋ is 0.9 ± 0.5 × 10^-9, close to the value of 1.6 - 2.4 × 10^-9 for massive dense cores. No evidence for HCO^＋ enhancement has been observed for this source. In aid of the IRAS data, the luminosity-to-mass ratio of the core was calculated to be in the range of 37 - 163（L/M）⊙. Based on the IRAS luminosity, a young stellar object of spectral type O7.5 has been formed in the IRAS 02232＋6138 core.