Atomic oscillator strengths in the spectral domain of Gaia

Details Atomic oscillator strengths in the spectral domain of Gaia Atomic oscillator strengths in the spectral domain of Gaia

Oct 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006mnras.372..609b&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 372, Issue 2, pp. 609-614.

Astronomy and Astrophysics

Astronomy

12

Atomic Data, Convection, Hydrodynamics, Line: Formation, Sun: Infrared, Sun: Photosphere

Scientific paper

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 FeI and SiI 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 (<0.1dex) 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 1dex. We address this conclusion to laboratories to encourage new oscillator strength measurements in the infrared, especially in the Gaia region.

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