Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Stellar laboratories. VII. New Kr IV - VII oscillator strengths and an
  improved spectral analysis of the hot, hydrogen-deficient DO-type white dwarf
  RE0503-289   For the spectral analysis of high-resolution and high-signal-to-noise (S/N)
spectra of hot stars, state-of-the-art non-local thermodynamic equilibrium
(NLTE) model atmospheres are mandatory. These are strongly dependent on the
reliability of the atomic data that is used for their calculation.
  New of Kr IV - VII oscillator strengths for a large number of lines allow to
construct more detailed model atoms for our NLTE model-atmosphere calculations.
This enables us to search for additional Kr lines in observed spectra and to
improve Kr abundance determinations.
  We calculated Kr IV - VII oscillator strengths to consider radiative and
collisional bound-bound transitions in detail in our NLTE stellar-atmosphere
models for the analysis of Kr lines exhibited in high-resolution and high-S/N
ultraviolet (UV) observations of the hot white dwarf RE 0503-289.
  We reanalyzed the effective temperature and surface gravity and determined
Teff = 70 000 +/- 2000 K and log (g / cm/s**2) = 7.5 +/- 0.1. We newly
identified ten Kr V lines and one Kr VI line in the spectrum of RE 0503-289. We
measured a Kr abundance of -3.3 +/- 0.3 (logarithmic mass fraction). We
discovered that the interstellar absorption toward RE 0503-289 has a
multi-velocity structure within a radial-velocity interval of -40 km/s < vrad <
+18 km/s.
  Reliable measurements and calculations of atomic data are a prerequisite for
state-of-the-art NLTE stellar-atmosphere modeling. Observed Kr V - VII line
profiles in the UV spectrum of the white dwarf RE 0503-289 were simultaneously
well reproduced with our newly calculated oscillator strengths.

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The categories of this paper are: math
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The categories of this paper are: nlin
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The categories of this paper are: econ
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The categories of this paper are: chao-dyn
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The categories of this paper are: stat
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The categories of this paper are: hep-th
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The categories of this paper are: mtrl-th
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The categories of this paper are: comp-gas
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The categories of this paper are: ao-sci
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The categories of this paper are: math-ph
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The categories of this paper are: acc-phys
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The categories of this paper are: adap-org
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The categories of this paper are: bayes-an
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The categories of this paper are: cmp-lg
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The categories of this paper are: eess
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The categories of this paper are: q-alg