Abstract
We report the first laboratory measurements of 10 absolute oscillator strengths (f-values) for vacuum ultraviolet lines of Co 11. 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 p 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 p Oph A and Oph. Cobalt is found to be less severely depleted onto grains than earlier analyses based on available theoretical /-values suggested. As a consequence of this revision, the correspondence between depletion and condensation temperature is somewhat weakened.
Original language | English |
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Pages (from-to) | 1064-1068 |
Number of pages | 5 |
Journal | Astrophysical Journal |
Volume | 500 |
Issue number | 2 PART I |
DOIs | |
State | Published - 1998 |
Externally published | Yes |
Keywords
- Atomic data
- ISM: abundances
- Methods: laboratory
- Ultraviolet: ISM