Wavelengths and oscillator strengths of Xe II from the UVES spectra of four HgMn stars

Aims. In spite of large overabundances of Xe II observed in numerous mercury-manganese (HgMn) stars, Xe II oscillator strengths are only available for a very limited number of transitions. As a consequence, several unidentified lines in the spectra of HgMn stars could be due to Xe II. In addition, some predicted Xe II lines are redshifted by about 0.1 angstrom from stellar unidentified lines, raising the question about the wavelength accuracy of the Xe II line data available in the literature. For these reasons we investigated the Xe II lines lying in the 3900-4521 angstrom, 4769-7542 angstrom, and 7660-8000 angstrom spectral ranges of four well-studied HgMn stars.