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A new stringent limit relating to the variation of the fine-structure constant (α= e2/4πε0ℏc) has been extracted from Ritz wavelengths of 27 quasi_stellar object (QSO) absorption spectra lines of Fe II. The calculation was combined with laboratory wavelengths and QSO spectra to obtain the result ∆α/α=(0.027±0.832)×10-6. This result suggests how dedicated astrophysical estimations can improve these limits in the future and can also constrain space_time variations.

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We report a newly updated constraint on space-time variation in the fine structure constant, α ¼ e 2 4πε 0 ℏc , from an analysis of white dwarf spectra. We obtain Δα/α = (0.007 ± 0.087) × 10 −6 from a comparison of laboratory spectra of Fe V with those found in the spectra from the white dwarf G191-B2B. The obtained result in this study is used to suggest further improvement in observational technique which would lead to a tighter constraint on Δα/α.