Free access article

A&A 381, 1090-1093 (2002)
DOI: 10.1051/0004-6361:20011540

Experimental oscillator strengths in U II of cosmological interest

H. Nilsson¹, S. Ivarsson¹, S. Johansson¹ and H. Lundberg<sup>2

1</sup>  Lund Observatory, Lund University, PO Box 43, 22100 Lund, Sweden
²  Department of Physics, Lund Institute of Technology, PO Box 118, 22100 Lund, Sweden
    e-mail: stefan.ivarsson@astro.lu.se; sveneric.johansson@astro.lu.se; hans.lundberg@fysik.lth.se

(Received 17 October 2001 / Accepted 30 October 2001)

Abstract
Oscillator strengths for 57 U II lines in the region 3500-6700 Å  have been derived by combining new branching fraction measurements with recently measured lifetimes. The lines combine six upper levels with numerous low levels having excitation energies of 0-1.5 eV. The data include the U II line at 3859 Å, which is used for cosmochronology.

Key words: atomic data -- stars: evolution -- Galaxy: evolution

Offprint request: H. Nilsson, hampus.nilsson@astro.lu.se

© ESO 2002

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