Astronomy and Astrophysics – Astronomy
Scientific paper
May 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...498..256z&link_type=abstract
Astrophysical Journal v.498, p.256
Astronomy and Astrophysics
Astronomy
21
Atomic Data, Ism: Abundances, Ultraviolet: Ism
Scientific paper
Absorption lines of trace metals like nickel are often used to measure the metallicity and depletion in H I regions within our Galaxy and others. Ultraviolet absorption lines from the dominant ion, Ni II, are generally weak, making them a convenient tool to study metallicity and depletion in these environments. As an aid for studies of dust evolution in galaxies, we obtained an adjusted set of precise relative oscillator strengths for Ni II lines occurring at ultraviolet wavelengths. This set of f-values was derived from curves of growth for interstellar absorption toward rho Oph A, chi Oph, and zeta Oph. In all, absorption from 12 lines was analyzed. Comparison with the compilation of Morton reveals good agreement for the stronger lines but significant differences for the weakest ones.
Federman Steven Robert
Zsargo Janos
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