Critically evaluated atomic data of Kr V-VI relevant to the hot DO-type white dwarf
RE 0503–289

Introduction:
Spectral lines of krypton (Kr V–VII) have been observed in the UV spectrum of the hot DO-
type white dwarf RE 0503–289. About ten spectral lines of Kr V and fourteen lines of Kr VI
have been used to determine the krypton abundance of it (Rauch et al. 2016; doi:
10.1051/0004-6361/201628131). Rauch et al. provided extensive atomic data (Kr IV–VII)
without any uncertainty estimates. However, reliable and evaluated atomic data of these ions
are essential for abundance determination. Recently, we evaluated transition probabilities for
Kr VI. In this work, we intended to perform the same for the Kr V spectrum and its detailed
comparison with the literature data.
Methods:
The theoretical calculations of the Kr V ion have been performed using the Cowan suite of
codes, in which the pseudo-relativistic Hartree–Fock (HFR) method is implemented. Multiple
comparison schemes were employed for transition probability evaluation.
Results and Discussion:
We used different HFR models with a varying number of configurations to compute the
transition probabilities. The transition probability data from these models and the data in the
literature were compared with each other. In general, the agreement between different data
sets was found to be satisfactory. The evaluated radiative transition parameters of Kr V-VI
lines relevant to the spectrum of the white dwarf RE 0503–289 have been tabulated.
Conclusion:
The transition probabilities were obtained from multiple extended HFR calculations for these
ions. The critical evaluation of transition probability data for Kr V-VI has been performed.
The reliable radiative transition parameters have been provided for Kr V–VI spectral lines
observed in the RE 0503–289 spectrum, along with their accuracy estimates.