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A search for close companions in Sco OB2
Thijs Kouwenhoven, Anthony Brown, Hans Zinnecker +3
Using adaptive optics we study the binary population in the nearby OB association Scorpius OB2. We present the first results of our near-infrared adaptive optics survey among 199 (…
The peculiar circumstellar environment of NGC2024-IRS2
A. Lenorzer, A. Bik, A. de Koter +5
We re-examine the nature of NGC2024-IRS2 in light of the recent discovery of the late O-type star, IRS2b, located 5 arcsec from IRS2. Using L-band spectroscopy, we set a lower limi…
The radial velocity curve of HD153919 (4U1700-37) revisited
G. Hammerschlag-Hensberge, M. H. van Kerkwijk, L. Kaper
We have re-analysed all available high-resolution ultraviolet IUE spectra of the high-mass X-ray binary HD153919/4U1700-37. The radial velocity semi-amplitude of 20.6 +/- 1.0 km/s…
The N Enrichment and Supernova Ejection of the Runaway Microquasar LS 5039
M. V. McSwain, D. R. Gies, W. Huang +3
We present an investigation of new optical and ultraviolet spectra of the mass donor star in the massive X-ray binary LS 5039. The optical band spectral line strengths indicate tha…
Variable polarization in the optical afterglow of GRB 021004
E. Rol, R. A. M. J. Wijers, J. P. U. Fynbo +19
We present polarimetric observations of the afterglow of gamma-ray burst (GRB) 021004, obtained with the Nordic Optical Telescope (NOT) and the Very Large Telescope (VLT) between 8…
A very energetic supernova associated with the gamma-ray burst of 29 March 2003
Jens Hjorth, Jesper Sollerman, Palle Møller +24
Over the past five years evidence has mounted that long-duration (> 2 s) gamma-ray bursts (GRBs)--the most brilliant of all astronomical explosions--signal the collapse of massive…