Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977a%26a....61...51k&link_type=abstract
Astronomy and Astrophysics, vol. 61, no. 1, Oct. 1977, p. 51-57. Research supported by the Deutsche Forschungsgemeinschaft.
Astronomy and Astrophysics
Astronomy
3
Atomic Excitations, Cobalt, Radiative Lifetime, Ultraviolet Astronomy, Astronomical Spectroscopy, Hyperfine Structure, Metallic Stars
Scientific paper
In the region of 3500 A the lifetimes of eight excited cobalt I levels have been measured by means of the zero-field level-crossing method. The measured lifetimes belong to the odd configurations 3d(7)4s4p and 3d(8)4p, and their accuracy is about 5 percent. The hyperfine structure of levels with I not equal to J has to be taken into account in evaluating lifetimes from level-crossing data because the nuclear spin of the natural isotope Co-59 is I equals 7/2. Therefore the influence of the line profile of the exciting resonance lines on the lifetimes has been investigated. The results are compared with those of other authors. Furthermore absolute oscillator strengths were calculated with known branching ratios, and an absolute scale has been established.
Becker Udo
Goebel L. H.
Klotz W. D.
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