Accurate abundance analysis of late-type stars: advances in atomic physics

Abstract

The measurement of stellar properties such as chemical compositions, masses and ages, through stellar spectra, is a fundamental problem in astrophysics. Progress in the understanding, calculation and measurement of atomic properties and processes relevant to the high-accuracy analysis of F-, G-, and K-type stellar spectra is reviewed, with particular emphasis on abundance analysis. This includes fundamental atomic data such as energy levels, wavelengths, and transition probabilities, as well as processes of photoionisation, collisional broadening and inelastic collisions. A recurring theme throughout the review is the interplay between theoretical atomic physics, laboratory measurements, and astrophysical modelling, all of which contribute to our understanding of atoms and atomic processes, as well as to modelling stellar spectra.

Review accepted for publication by The A&A Review (Springer), 9 Figures, 3 Tables, 56 pages

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• Assessing the performance of LTE and NLTE synthetic stellar spectra in a machine learning framework
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• Mutual neutralisation in Li${}^{+}$+H${}^{-}$/D${}^{-}$ and Na${}^{+}$+H${}^{-}$/D${}^{-}$ collisions: Implications of experimental results for non-LTE modelling of stellar spectra
• Excitation and charge transfer in low-energy hydrogen atom collisions with neutral oxygen
• 3D NLTE modelling of Y and Eu. Centre-to-limb variation and solar abundances
• Electron-impact excitation and ionization of atomic calcium at intermediate energies
• Excitation and charge transfer in low-energy hydrogen atom collisions with neutral carbon and nitrogen
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• The Belgian repository of fundamental atomic data and stellar spectra (BRASS) II. Quality assessment of atomic data for unblended lines in FGK stars
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• Excitation and charge transfer in low-energy hydrogen atom collisions with neutral manganese and titanium
• AC polarizability and photoionization cross-section measurements in an optical lattice
• The Impact of Inelastic Collisions with Hydrogen on NLTE Copper Abundances in Metal-Poor Stars
• A conclusive non-detection of magnetic field in the Am star o Peg with high-precision near-infrared spectroscopy
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• Nuclear astrophysics