Open AccessAtomic oscillator strengths in the spectral domain of Gaia
Author(s) -
Bigot L.,
Thévenin F.
Publication year - 2006
Publication title -
monthly notices of the royal astronomical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.058
H-Index - 383
eISSN - 1365-2966
pISSN - 0035-8711
DOI - 10.1111/j.1365-2966.2006.10701.x
Subject(s) - physics , radiative transfer , spectrometer , oscillator strength , spectral line , line (geometry) , range (aeronautics) , infrared , domain (mathematical analysis) , atomic spectroscopy , atomic physics , computational physics , astrophysics , spectroscopy , optics , astronomy , aerospace engineering , geometry , mathematical analysis , mathematics , engineering
This paper presents the results of a detailed investigation of the validity of oscillator strengths in the spectral domain of the Gaia spectrometer 848–875 nm. This analysis is performed by fitting the most significant Fe i and Si i solar lines in this spectral range with synthetic profiles calculated by 3D radiative hydrodynamical (RHD) simulations. Our main conclusion is that the laboratory oscillator strengths agree well (< 0.1 dex) with values derived from 3D simulations, whereas the semi‐empirical values found in data bases like the Vienna Atomic Line Database are imprecise, with a disagreement that can be as large as 1 dex. We address this conclusion to laboratories to encourage new oscillator strength measurements in the infrared, especially in the Gaia region.