The interstellar material in front of Chi Ophiuchi. I - Optical observations
The interstellar material in front of Chi Ophiuchi. I - Optical observations
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蛇夫座面前的星际物质。
DOI：
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发表时间：
1979
期刊：
影响因子：
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通讯作者：
P. Frisch
中科院分区：
文献类型：
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作者：
P. Frisch
讨论了对蛇夫星前星际物质的光学观测。主星际云由几个速度在-6到-12 km /s（日心）之间的区域组成。CH和CH/sup +/都在这个特征中，但中心速度相差2 km s/sup -1/。另一个云的速度为-26 km /s /sup -1/，包含相对较强的Ca/sup +/线。它在Ca/sup +/和Na/sup 0/柱密度之间有一个比率，适合于“高速”云。钙、铁和钠柱密度被用来估计视线和每个云的平均电子密度。根据目前有关CH和CH/sup +/的起源理论，分析了CH和CH/sup +/的丰度，以及CN的缺失。
Optical observations of the interstellar material in front of chi Oph are discussed. The main interstellar cloud is made up of several regions with velocities between -6 and -12 km s/sup -1/ (heliocentric). Both CH and CH/sup +/ are found within this feature, but with central velocities which differ by 2 km s/sup -1/. Another cloud, with a velocity of -26 km s/sup -1/, contains relatively strong Ca/sup +/ lines. It has a ratio between Ca/sup +/ and Na/sup 0/ column densities that is appropriate for 'high-velocity' clouds. Calcium, iron, and sodium column densities are used to estimate an average electron density for the line of sight as well as for each cloud. The abundances of CH and CH/sup +/ , and the absence of CN, are analyzed in terms of current theories about their origin.