70 citations · 70 across the 1 of their papers we have counts for
7 papers
The time delay of the quadruple quasar RX J0911.4+0551
Jens Hjorth, Ingunn Burud, Andreas O. Jaunsen +9
We present optical lightcurves of the gravitationally lensed components A (=A1+A2+A3) and B of the quadruple quasar RX J0911.4+0551 (z = 2.80). The observations were primarily obta…
An optical time-delay estimate for the double gravitational lens system B1600+434
I. Burud, J. Hjorth, A. O. Jaunsen +7
We present optical I-band light curves of the gravitationally lensed double QSO B1600+434 from observations obtained at the Nordic Optical Telescope (NOT) between April 1998 and No…
Solar rotation inversions and the relationship between a-coefficients and mode splittings
Frank P. Pijpers
From the observing campaigns of a number of helioseismic telescope networks such as the Global Oscillation Network Group (GONG) and also from the Solar Heliospheric Observatory sat…
The determination of time lags using SOLA
Frank P. Pijpers
A common problem in astronomy is the determination of the time shift between two otherwise identical time series of measured flux from a variable source, in short the determination…
Inversions in astronomy and the SOLA method
F. P. Pijpers
This paper was presented at the Institute for Mathematics and its Applications workshop "Inverse problems in wave propagation" and will appear in the series IMA volumes (Springer).…
On the propagation of sound waves in a stellar wind traversed by periodic strong shocks
F. P. Pijpers
It has been claimed that in stellar winds traversed by strong shocks the mechanism for driving the wind by sound wave pressure cannot operate because sound waves cannot propagate p…