Stellar laboratories . VIII. New Zr iv-vii, Xe iv-v, and Xe vii oscillator strengths and the Al, Zr, and Xe abundances in the hot white dwarfs G191-B2B and RE 0503-289
Abstract
Context. For the spectral analysis of high-resolution and high-signal-to-noise 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.
Aims: To search for zirconium and xenon lines in the ultraviolet (UV) spectra of
Methods: We calculated Zr iv-vii, Xe iv-v, and Xe vii oscillator strengths to consider radiative and collisional bound-bound transitions of Zr and Xe in our NLTE stellar-atmosphere models for the analysis of their lines exhibited in UV observations of the hot WDs
Results: We identified one new Zr iv, 14 new Zr v, and ten new Zr vi lines in the spectrum of
Conclusions: Precise measurements and calculations of atomic data are a prerequisite for advanced NLTE stellar-atmosphere modeling. Observed Zr iv-vi and Xe vi-vii line profiles in the UV spectrum of
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- March 2017
- DOI:
- 10.1051/0004-6361/201629794
- arXiv:
- arXiv:1611.07364
- Bibcode:
- 2017A&A...599A.142R
- Keywords:
-
- atomic data;
- line: identification;
- stars: abundances;
- stars: individual: G191-B2B;
- stars: individual: RE0503-289;
- virtual observatory tools;
- Physics - Atomic Physics;
- Astrophysics - Solar and Stellar Astrophysics
- E-Print:
- 137 pages, 11 figures