000004758 001__ 4758
000004758 005__ 20200203160451.0
000004758 0247_ $$2DOI$$a10.1051/0004-6361/201833553
000004758 037__ $$aSCART-2020-0058
000004758 100__ $$aLaverick, M.
000004758 245__ $$aThe Belgian repository of fundamental atomic data and stellar spectra (BRASS). II. Quality assessment of atomic data for unblended lines in FGK stars
000004758 260__ $$c2019
000004758 520__ $$aContext. Fundamental atomic transition parameters, such as oscillator strengths and rest wavelengths, play a key role in modelling and understanding the chemical composition of stars in the universe. Despite the significant work under way to produce these parameters for many astrophysically important ions, uncertainties in these parameters remain large and can limit the accuracy of chemical abundance determinations. Aims: The Belgian repository of fundamental atomic data and stellar spectra (BRASS) aims to provide a large systematic and homogeneous quality assessment of the atomic data available for quantitative spectroscopy. BRASS shall compare synthetic spectra against extremely high-quality observed spectra, at a resolution of ̃85 000 and signal-noise ratios of ̃1000, for approximately 20 bright BAFGK spectral-type stars, in order to critically evaluate the atomic data available for over a thousand potentially useful spectral lines. Methods: A large-scale homogeneous selection of atomic lines is performed by synthesising theoretical spectra of literature atomic lines for FGK-type stars including the Sun, resulting in a selection of 1091 theoretically deep and unblended lines in the wavelength range 4200-6800 Å, which may be suitable for quality assessment. Astrophysical log(gf) values are determined for the 1091 transitions using two commonly employed methods. The agreement of these log(gf) values are used to select well-behaved lines for quality assessment. Results: We found 845 atomic lines to be suitable for quality assessment, of which 408 were found to be robust against systematic differences between analysis methods. Around 53% of the quality-assessed lines were found to have at least one literature log(gf) value in agreement with our derived values, though the remaining values can disagree by as much as 0.5 dex. Only ̃38% of Fe I lines were found to have sufficiently accurate log(gf) values, increasing to ̃70-75% for the remaining Fe-group lines.
000004758 594__ $$aNO
000004758 6531_ $$astars: solar-type
000004758 6531_ $$aline: profiles
000004758 6531_ $$aatomic data
000004758 6531_ $$aastronomical databases: miscellaneous
000004758 6531_ $$aAstrophysics - Solar and Stellar Astrophysics
000004758 700__ $$aLobel, A.
000004758 700__ $$aRoyer, P.
000004758 700__ $$aMerle, T.
000004758 700__ $$aMartayan, C.
000004758 700__ $$avan Hoof, P. A. M.
000004758 700__ $$aVan der Swaelmen, M.
000004758 700__ $$aDavid, M.
000004758 700__ $$aHensberge, H.
000004758 700__ $$aThienpont, E.
000004758 773__ $$cA60 (51 pages)$$pAstronomy and Astrophysics$$v624$$y2019
000004758 8560_ $$fpeter.vanhoof@observatoire.be
000004758 85642 $$ahttps://arxiv.org/abs/1902.03821
000004758 905__ $$apublished in
000004758 980__ $$aREFERD