We present a dynamical study of the intermediate polar and dwarf nova cataclysmic variable GK Persei (Nova Persei 1901) based on a multisite optical...
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PublicationThe intermediate polar cataclysmic variable GK Persei 120 years after the nova explosion: a first dynamical mass study
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PublicationThe isotopic ^6Li/^7Li ratio in Centaurus X-4 and the origin of Li in X-ray binaries
Context: Cool stars, companions to compact objects, are known to show Li abundances which are high compared to field stars of the same spectral type, which are...
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PublicationThe jet-powered optical nebula of Cygnus X-1
We present Hα and [OIII] (5007 Å) images of the nebula powered by the jet of the black hole candidate and microquasar Cygnus X-1, observed with the 2.5-m Isaac...
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PublicationThe Line Emission Region in III Zw 2: Kinematics and Variability
We have studied the Lyα, Hβ, Hα, and Mg II λ2798 line profiles of the Seyfert 1 galaxy III Zw 2. The shapes of these broad emission lines show evidence of a...
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PublicationThe longest thermonuclear X-ray burst ever observed?. A BeppoSAX Wide Field Camera observation of 4U 1735-44
A long flux enhancement, with an exponential decay time of 86 min, is detected in 4U 1735-44 with the BeppoSAX Wide Field Cameras. We argue that this is a type...
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PublicationThe low-luminosity accretion disc wind of the black hole transient V4641 Sagittarii
We present an optical spectroscopic study of the black hole X-ray transient V4641 Sgr (=SAX J1819.3-2525) covering the 1999, 2002, and 2004 outbursts. The...
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PublicationThe magnetic SW Sextantis star RXJ1643.7+3402
We present time-resolved spectroscopy and circular spectropolarimetry of the SW Sex star RXJ1643.7+3402. We find significant polarization levels exhibiting a...
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PublicationThe mass and helium discrepancy in massive stars: the case Vela X-1.
A NLTE-analysis is presented of high S/N spectra of the optical component of the standard massive X-ray binary Vela X-1. In combination with the orbital...
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PublicationThe Mass Donor of Scorpius X-1 Revealed
We present the first detection of the mass donor star in the prototype X-ray binary Scorpius X-1. Phase-resolved spectroscopy revealed narrow emission line...