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Low-resolution VLT spectroscopy of GRBs 991216, 011211 and 021211
P. M. Vreeswijk, A. Smette, A. S. Fruchter +16
We present low-resolution VLT spectroscopy of the afterglow of the gamma-ray bursts (GRBs) 991216, 011211 and 021211. Our spectrum of GRB991216 is the only optical spectrum for thi…
Massive Young Stellar Objects in high-mass star-forming regions
Arjan Bik, Lex Kaper, Wing-Fai Thi +1
High-quality K-band spectra of point sources, deeply embedded in massive star-forming regions, have revealed a population of 20 young massive stars showing no photospheric absorpti…
Massive Stars and their Compact Remnants in High-mass X-ray Binaries
L. Kaper, A. van der Meer
In a high-mass X-ray binary (HMXB) a massive star interacts with a neutron-star or black-hole companion in various ways. The gravitational interaction enables the measurement of fu…
On the mass distribution of neutron stars in HMXBs
A. van der Meer, L. Kaper, M. H. van Kerkwijk +1
We present the results of a monitoring campaign of three eclipsing high-mass X-ray binaries (HMXBs: SMC X-1, LMC X-4 and Cen X-3). High-resolution VLT/UVES spectra are used to meas…
How Special Are Dark Gamma-Ray Bursts: A Diagnostic Tool
E. Rol, R. A. M. J. Wijers, C. Kouveliotou +2
We present here a comprehensive study of the optical/near-infrared (IR) upper limits for gamma-ray bursts that have an X-ray afterglow. We have extrapolated the X-ray afterglows to…