61 citations · 93 across the 7 of their papers we have counts for
7 papers
The Information Content of Quasar Variability Light Curves: How Well Can we Infer Stochastic Model Parameters?
Brendon J. Brewer, Geraint F. Lewis, Xiang Yu +1
Quasar variability, driven by multi-scale physical processing within a relativistic accretion disk, is commonly modelled with stochastic time series models. The simplest of these i…
Gravitational Microlensing of a Reverberating Quasar Broad Line Region - I. Method and Qualitative Results
H. Garsden, N. F. Bate, G. F. Lewis
The kinematics and morphology of the broad emission line region (BELR) of quasars are the subject of significant debate. The two leading methods for constraining BELR properties ar…
Infall variability in the Classical T Tauri system VZ Chamaeleonis
K. W. Smith, G. F. Lewis, I. A. Bonnell +1
We present time series spectroscopy of the Classical T Tauri star VZ Cha. We follow spectral variations at intermediate resolution over five successive nights, or approximately two…
Microlensing induced spectral variability in Q2237+0305
G. F. Lewis, M. J. Irwin, P. C. Hewett +1
We present both photometry and spectra of the individual images of the quadruple gravitational lens system Q2237+0305. Comparison of spectra obtained at two epochs, separated by $\…
T Tauri variability in the context of the beat-frequency model
K. W. Smith, G. F. Lewis, I. A. Bonnell
We examine the implications of a beat frequency modulated model of T Tauri accretion. In particular we show that measurements of the variability of accretion generated lines can be…
Microlensing Induced Spectral Variability In Q2237+0305
G. F. Lewis, M. J. Irwin, P. C. Hewett
Several macrolensed systems exhibit photometric variability consistent with microlensing due to objects of stellar mass located in the lens. The degree of microlensing amplificatio…
Beat Frequency Modulation of T Tauri Accretion Rates
K. W. Smith, I. A. Bonnell, G. F. Lewis
A general model of magnetically controlled accretion onto T Tauri stars is presented. In this model the magnetic field is oriented arbitrarily in relation to the star's rotation ax…