We have conducted a spectral line survey of IRC +10216 using the Caltech Submillimeter Observatory to an average sensitivity of < or approximately 95 mK. A deconvolution algorithm has been used to derive the continuous single-sideband spectrum from 330.2 to 358.1 GHz. A total of 56 spectral lines were detected of which 54 have been identified with 8 molecules and a total of 18 isotopomers. The observed lines are used to derive column densities and relative abundances for the detected species. Within this frequency range the spectral lines detected contribute the majority of the total flux emitted by IRC +10216. We use the derived column densities and excitation temperatures to simulate the molecular line emission (assuming LTE) at frequencies up to 1000 GHz. The observed and simulated flux from line emission is compared to broadband total flux measurements and to dust emission assuming a power-law variation of the dust emissivity. We conclude that significant corrections for the line flux must be made to broadband flux measurements of IRC +10216 at wavelengths longer than approximately 750 micrometers.

中文翻译：

---

IRC +10216在330至358 GHz之间的分子发射谱。

我们使用加州理工学院亚毫米波观测台对IRC +10216进行了谱线调查，得出平均灵敏度<或约为95 mK。去卷积算法已用于导出330.2至358.1 GHz的连续单边带频谱。总共检测到56条谱线，其中54条已被8个分子和18个同位素异构体所鉴定。观察到的线用于导出检测到的物种的柱密度和相对丰度。在此频率范围内，检测到的谱线贡献了IRC +10216发射的总通量的大部分。我们使用导出的列密度和激发温度来模拟在高达1000 GHz的频率下的分子线发射（假设LTE）。假定粉尘发射率的幂律变化，将来自线路发射的观测和模拟通量与宽带总通量测量结果和粉尘发射进行比较。我们得出的结论是，必须对波长大于约750微米的IRC +10216宽带通量测量进行线通量的重大校正。