Measuring chemical evolution and gravitational dependence of αusing ultraviolet Fe V and Ni V transitions in white-dwarf spectra

Abstract

In this paper, we present the details of the ab initio high-precision configuration interaction and many-body perturbation theory calculations that were used in a previous work to place limits on the dependence of the fine-structure constant, alpha, on the gravitational field of the white-dwarf star G191-B2B. These calculations were combined with laboratory wavelengths and spectra from the Hubble Space Telescope Imaging Spectrograph to obtain limits on the gravitational alpha-dependence using Fe V and Ni V transitions. The uncertainty in these results are dominated by the uncertainty in the laboratory wavelengths. In this work we also present ab initio calculations of the isotopic shifts of the Fe V transitions. We show that improved laboratory spectra will enable determination of the relative isotope abundances in Fe V to an accuracy ~20%. Therefore this work provides a strong motivation for new laboratory measurements.

References in corpus (7)

• Spatial variation in the fine-structure constant -- new results from VLT/UVES
• New limits on variation of the fine-structure constant using atomic dysprosium
• Limits on the dependence of the fine-structure constant on gravitational potential from white-dwarf spectra
• Variation of fundamental constants: theory and observations
• Isotope shift calculations in Ti II
• How changing physical constants and violation of local position invariance may occur?
• A comprehensive near and far ultraviolet spectroscopic study of the hot DA white dwarf G191-B2B

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• Measuring the fine structure constant on a white dwarf surface; a detailed analysis of Fe V absorption in G191-B2B
• Saturated configuration interaction calculations for five-valent Ta and Db
• Energy levels and radiative rates for transitions in Cr-like Co IV and Ni V