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'Round the Clock Observations of the Q0957+561 A,B Gravitationally Lensed Quasar
Wesley N. Colley, Rudolph E. Schild, Cristina Abajas +20
An observing campaign with 10 participating observatories has undertaken to monitor the optical brightness of the Q0957 gravitationally lensed quasar for 10 consecutive nights in J…
Time delay in QSO 0957+561 from 1984-99 optical data
A. Oscoz, D. Alcalde, M. Serra-Ricart +6
Photometric optical data of QSO 0957+561 covering the period 1984-99 are analyzed to discern between the two values of the time delay (417 and 424 days) mostly accepted in the rece…
Optical studies of the X-ray transient XTE J2123-058 - II. Phase-resolved spectroscopy
R. I. Hynes, P. A. Charles, C. A. Haswell +3
We present time-resolved spectroscopy of the soft X-ray transient XTE J2123-058 in outburst. A useful spectral coverage of 3700-6700A was achieved spanning two orbits of the binary…