Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Centre National de la Recherche ScientifiqueFR737 papers
- University of CambridgeGB465 papers
- European Southern ObservatoryCL427 papers
- Center for Astrophysics Harvard & SmithsonianUS421 papers
- University of EdinburghGB387 papers
- University of GenevaCH379 papers
- University of WarwickGB331 papers
- Keele UniversityGB330 papers
- Royal ObservatoryGB329 papers
- Instituto de Astrofísica de CanariasES306 papers
- Scottish Universities Physics AllianceGB303 papers
- Space Telescope Science InstituteUS302 papers
18 papers · 1 filter
Echo Mapping of AGN Emission Regions
Keith Horne
Echo mapping exploits light travel time delays, revealed by multi-wavelength variability studies, to map the geometry, kinematics, and physical conditions of reprocessing sites in…
Optical and UV observations of a strong flare in the young, single K2-dwarf LQ Hya
D. Montes, S. H. Saar, A. Collier Cameron +1
We present high resolution optical echelle spectra and IUE observations during a strong flare on 1993 December 22 in the very active, young, rapidly rotating, single K2 dwarf LQ Hy…
A new direct method for measuring the Hubble constant from reverberating accretion discs in active galaxies
Stefan Collier, Kieth Horne, Ignaz Wanders +1
We show how wavelength-dependent time delays between continuum flux variations of AGN can be used to test the standard black hole-accretion disc paradigm, by measuring the temperat…
Modelling of the magnetic accretion flow in HU Aquarii
Claus Heerlein, Keith Horne, Axel D. Schwope
We present a magnetic stripping model for AM Her type objects. Our model is based on an equilibrium condition between ram pressure and magnetic pressure in a stiff dipolar magnetic…
Lithium in Blanco1: Implications for Stellar Mixing
R. D. Jeffries, D. J. James
We obtain lithium abundances for G and K stars in Blanco 1, an open cluster with an age similar to, or slightly younger than, the Pleiades. We critically examine previous spectrosc…
The Discovery and Broad-band Follow-up of the Transient Afterglow of GRB 980703
J. S. Bloom, D. A. Frail, S. R. Kulkarni +14
We report on the discovery of the radio, infrared and optical transient coincident with an X-ray transient proposed to be the afterglow of GRB 980703. At later times when the trans…
Echoes from an Irradiated Disc in GRO J1655-40
R. I. Hynes, K. O'Brien, Keith Horne +2
We demonstrate correlated rapid variability between the optical/UV and X-ray emission for the first time in a soft X-ray transient, GRO J1655-40: HST light curves show similar feat…
A double-frequency dwarf nova oscillation
T. R. Marsh, Keith Horne
We have detected coherent oscillations (``dwarf nova oscillations'') in Hubble Space Telescope spectra of the dwarf nova OY Car. The oscillations were seen towards the end of a sup…
The mass and radius of the M dwarf companion to GD 448
P. F. L. Maxted, T. R. Marsh, C. Moran +2
We present spectroscopy and photometry of GD 448, a detached white dwarf - M dwarf binary with a period of 2.47h. We find that the NaI 8200A feature is composed of narrow emission…
HST spatially-resolved spectra of the accretion disc and gas stream of the nova-like variable UX Ursae Majoris
R. Baptista, K. Horne, R. A. Wade +3
Time-resolved eclipse spectroscopy of the nova-like variable UX UMa obtained with the HST/FOS on 1994 August and November is analyzed with eclipse mapping techniques to produce spa…
Flux-Line Lattice Structures in Untwinned YBa2Cu3O
S. T. Johnson, E. M. Forgan, S. H. Lloyd +8
A small angle neutron scattering study of the flux-line lattice in a large single crystal of untwinned YBa2Cu3O is presented. In fields parallel to the c-axis, diffraction spots ar…
The 1996 Outburst of GRO J1655-40: The Challenge of Interpreting the Multi-wavelength Spectra
R. I. Hynes, C. A. Haswell, C. R. Shrader +6
We report on the results of a campaign to observe the SXT GRO J1655-40 in outburst using HST, XTE and GRO and AAT. This outburst was qualitatively quite different to other SXT outb…
Classification of bicovariant differential calculi on the Jordanian quantum groups GL_{g,h}(2) and SL_{h}(2) and quantum Lie algebras
Andrew D. Jacobs, J. F. Cornwell
We classify all 4-dimensional first order bicovariant calculi on the Jordanian quantum group GL_{h,g}(2) and all 3-dimensional first order bicovariant calculi on the Jordanian quan…
Optical Continuum and Emission-Line Variability of Seyfert 1 Galaxies
Bradley M. Peterson, Ignaz Wanders, Ray Bertram +3
We present the light curves obtained during an eight-year program of optical spectroscopic monitoring of nine Seyfert 1 galaxies: 3C 120, Akn 120, Mrk 79, Mrk 110, Mrk 335, Mrk 509…
On Uncertainties in Cross-Correlation Lags and the Reality of Wavelength-Dependent Continuum Lags in Active Galactic Nuclei
Bradley M. Peterson, Ignaz Wanders, Keith Horne +4
We describe a model-independent method of assessing the uncertainties in cross-correlation lags determined from AGN light curves, and use this method to investigate the reality of…
Steps toward Determination of the Size and Structure of the Broad-Line Region in Active Galactic Nuclei. XII. Ground-Based Monitoring of 3C 390.3
M. Dietrich, B. M. Peterson, P. Albrecht
Results of a ground-based optical monitoring campaign on 3C 390.3 in 1994-95 are presented. The broad-band fluxes (B, V, R, and I), the spectrophotometric optical continuum flux F(…
Recovery of 29-s Oscillations in HST/FOS Eclipse Observations of the Cataclysmic Variable UX Ursae Majoris
C. Knigge, N. Drake, K. S. Long +3
[abridged abstract] Low amplitude (~=0.5%) 29-s oscillations have been detected in HST/FOS eclipse observations of the nova-like cataclysmic variable UX UMa. These are the same dwa…
HST/FOS Eclipse Observations of the Nova-like Cataclysmic Variable UX Ursae Majoris
C. Knigge, K. S. Long, R. A. Wade +4
[abridged abstract] We present and analyze Hubble Space Telescope observations of the eclipsing nova-like cataclysmic variable UX UMa obtained with the Faint Object Spectrograph. T…