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55 papers · 1 filter
Non-confirmation of reported HI clouds without optical counterparts in the Hercules Cluster
W. van Driel, K. O'Neil, V. Cayatte +8
21 cm HI line observations were made with the Arecibo Gregorian telescope of 9 HI clouds in the Hercules Cluster which were reported as tenative detections in a VLA HI study of the…
A multi-colour study of the dark GRB 000210 host galaxy and its environment
J. Gorosabel, L. Christensen, J. Hjorth +25
We present UBVRIZJsHKs broad band photometry of the host galaxy of the dark gamma-ray burst (GRB) of February 10, 2000. These observations represent the most exhaustive photometry…
Lobe Advance Velocities in the Extragalactic Compact Symmetric Object 4C 31.04
M. Giroletti, G. Giovannini, G. B. Taylor +3
We report on the results of a two epoch study of the low power Compact Symmetric Object 4C 31.04. Observations performed with the VLBA at 5 GHz in 1995 and 2000 have yielded images…
The effect of stellar compressibility and non-resonant dynamic tides on the apsidal-motion rate in close binaries
B. Willems, A. Claret
The paper is devoted to the analysis of the systematic deviations between the classical formula for the rate of secular apsidal motion in close binaries and the formula established…
Optical Photometry of GRB 021004: The First Month
Stephen T. Holland, Michael Weidinger, Johan P. U. Fynbo +17
We present U,B,V,R_C,and I_C photometry of the optical afterglow of the gamma-ray burst GRB 021004 taken at the Nordic Optical Telescope between approximately eight hours and 30 da…
Absorption Systems in the Spectrum of GRB 021004
P. Møller, J. P. U. Fynbo, J. Hjorth +10
We report on a 3600 s spectrum of GRB 021004 obtained with the Nordic Optical Telecope on La Palma 10.71 hours after the burst. We identify absorption lines from five systems at re…