2015A&A...577A..88R

For the spectral analysis of spectra of hot stars with a high resolution and high signal-to-noise ratio (S/N), advanced non-local thermodynamic equilibrium (NLTE) model atmospheres are mandatory. These are strongly dependent on the reliability of the atomic data that are used for their calculation. Reliable XeVI oscillator strengths are used to identify Xe lines in the ultraviolet spectrum of the DO-type white dwarf RE0503-289 and to determine its photospheric Xe abundance. We publish newly calculated oscillator strengths that are based on a recently measured XeVI laboratory line spectrum. These strengths were used to consider their radiative and collisional bound-bound transitions in detail in our NLTE stellar-atmosphere models to analyze XeVI lines exhibited in high-resolution and high S/N UV observations of RE0503-289 . We identify three hitherto unknown XeVI lines in the ultraviolet spectrum of RE0503-289 and confirm the previously measured photospheric Xe abundance of this white dwarf (log Xe=-4.2±0.6 by mass). Reliable measurements and calculations of atomic data are prerequisite for stellar-atmosphere modeling. Observed XeVI line profiles in the ultraviolet spectrum of the white dwarf RE0503-289 were well reproduced with the newly calculated XeVI oscillator strengths.