We report the first laboratory measurements of 10 absolute oscillator strengths (f-values) for vacuum ultraviolet lines of Co II. The oscillator strengths are measured with the High-Sensitivity Absorption Spectroscopy Experiment at the University of Wisconsin. The measurements serve as a test of theoretical work on Co II f-values and set an absolute scale for relative oscillator strengths from spectra taken with the Hubble Space Telescope. Observations of interstellar absorption in the direction of ρ Oph A result in the determination of the f-value for an additional line. The set of absolute f-values is used to derive the interstellar abundance of cobalt toward ρ Oph A and ζ Oph. Cobalt is found to be less severely depleted onto grains than earlier analyses based on available theoretical f-values suggested. As a consequence of this revision, the correspondence between depletion and condensation temperature is somewhat weakened.
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机译：我们报告了Co II真空紫外线线的10个绝对振荡器强度（f值）的首次实验室测量结果。威斯康星大学的高灵敏度吸收光谱实验测量了振荡器的强度。这些测量值是对Co II f值的理论工作的测试，并根据哈勃太空望远镜拍摄的光谱为相对振荡器强度设置了绝对标度。在ρOph A方向上星际吸收的观察结果确定了另一条线的f值。一组绝对的f值用于推导出钴向ρOph A和ζOph的星际丰度。根据建议的可用理论f值，发现钴比早期分析的耗散少。作为该修改的结果，消耗和冷凝温度之间的对应性被稍微削弱。
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