IRC +10216中振动激发CO的检测
Detection of Vibrationally Excited CO in IRC+10216
摘要：
利用亚毫米波阵，我们探测到CO第一振动激发态到极端碳星IRC+10216（CW Leo）的J=3-2和2-1转动跃迁。辐射在空间上仍然是不可分辨的，角分辨率为~2”，并且考虑到这些谱线起源于基态以上~3100 K的能级，几乎可以肯定起源于靠近恒星光球的一个小得多的区域（~10^{14} cm）。谱线的热激发需要约10^{9} cm^{-3}的气体密度，这比基于IRC+10216内部尘埃壳的先前红外观测和模型的预期气体密度高出约一个数量级。
英文摘要：
Using the Submillimeter Array we have detected the J=3-2 and 2-1 rotational transitions from within the first vibrationally excited state of CO toward the extreme carbon star IRC+10216 (CW Leo). The emission remains spatially unresolved with an angular resolution of ~2" and, given that the lines originate from energy levels that are ~3100 K above the ground state, almost certainly originates from a much smaller (~10^{14} cm) sized region close to the stellar photosphere. Thermal excitation of the lines requires a gas density of ~10^{9} cm^{-3}, about an order of magnitude higher than the expected gas density based previous infrared observations and models of the inner dust shell of IRC+10216.
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