488 citations · 692 across the 10 of their papers we have counts for
10 papers
Measuring the fine structure constant on a white dwarf surface; a detailed analysis of Fe V absorption in G191-B2B
J. Hu, J. K. Webb, T. R. Ayres +12
The gravitational potential phi = GM/Rc^2 at the surface of the white dwarf G191-B2B is 10,000 times stronger than that at the Earth's surface. Numerous photospheric absorption fea…
Four direct measurements of the fine-structure constant 13 billion years ago
Michael R. Wilczynska, John K. Webb, Matthew Bainbridge +14
Observations of the redshift z=7.085 quasar J1120+0641 have been used to search for variations of the fine structure constant, alpha, over the redshift range 5.5 to 7.1. Observatio…
A far-UV survey of three hot, metal-polluted white dwarf stars: WD0455-282, WD0621-376, and WD2211-495
S. P. Preval, M. A. Barstow, M. Bainbridge +7
Using newly obtained high-resolution data () from the \textit{Hubble Space Telescope}, and archival UV data from the \textit{Far Ultraviolet Spectroscopic E…
Constraining the magnetic field on white dwarf surfaces; Zeeman effects and fine structure constant variation
J. Hu, J. K. Webb, T. R. Ayres +12
White dwarf atmospheres are subjected to gravitational potentials around times larger than occur on Earth. They provide a unique environment in which to search for any possi…
Unravelling the baffling mystery of the ultrahot wind phenomenon in white dwarfs
Nicole Reindl, M. Bainbridge, N. Przybilla +6
The presence of ultra-high excitation (UHE) absorption lines (e.g., O VIII) in the optical spectra of several of the hottest white dwarfs poses a decades-long mystery and is someth…
Evaluating the New Automatic Method for the Analysis of Absorption Spectra Using Synthetic Spectra
Matthew B. Bainbridge, John K. Webb
We recently presented a new "artificial intelligence" method for the analysis of high-resolution absorption spectra (Bainbridge and Webb, Mon. Not. R. Astron. Soc. 2017, 468,1639-1…
Probing the Gravitational Dependence of the Fine-Structure Constant from Observations of White Dwarf Stars
Matthew B. Bainbridge, Martin A. Barstow, Nicole Reindl +12
Hot white dwarf stars are the ideal probe for a relationship between the fine-structure constant and strong gravitational fields, providing us with an opportunity for a direct obse…
Artificial intelligence applied to the automatic analysis of absorption spectra. Objective measurement of the fine structure constant
Matthew B. Bainbridge, John K. Webb
A new and automated method is presented for the analysis of high-resolution absorption spectra. Three established numerical methods are unified into one "artificial intelligence" p…
A new analysis of fine-structure constant measurements and modelling errors from quasar absorption lines
Michael R. Wilczynska, John K. Webb, Julian A. King +3
We present an analysis of 23 absorption systems along the lines of sight towards 18 quasars in the redshift range of observed on the Very Large Telescop…
Indications of a spatial variation of the fine structure constant
J. K. Webb, J. A. King, M. T. Murphy +3
We previously reported Keck telescope observations suggesting a smaller value of the fine structure constant, alpha, at high redshift. New Very Large Telescope (VLT) data, probing…