72 citations · 189 across the 9 of their papers we have counts for
6 papers · 1 filter
Kelu-1 AB - A possible brown dwarf triple system
M. B. Stumpf, W. Brandner, Th. Henning +5
We have monitored the benchmark L dwarf binary Kelu-1AB over the past 3 years to derive improved spectral types and luminosities for the individual components. The astrometric meas…
The AstraLux large M dwarf survey
Felix Hormuth, Wolfgang Brandner, Markus Janson +2
AstraLux is the Lucky Imaging camera for the Calar Alto 2.2-m telescope and the 3.5-m NTT at La Silla. It allows nearly diffraction limited imaging in the SDSS i' and z' bands of o…
Near-infrared wavefront sensing for the VLT interferometer
Stefan Hippler, Wolfgang Brandner, Yann Clénet +11
The very large telescope (VLT) interferometer (VLTI) in its current operating state is equipped with high-order adaptive optics (MACAO) working in the visible spectrum. A low-order…
GRAVITY: getting to the event horizon of Sgr A*
F. Eisenhauer, G. Perrin, W. Brandner +45
We present the second-generation VLTI instrument GRAVITY, which currently is in the preliminary design phase. GRAVITY is specifically designed to observe highly relativistic motion…
MicroLux: high-precision timing of high-speed photometric observations
Felix Hormuth
MicroLux is a GPS-based high precision and high speed timing add-on to the Calar Alto Lucky Imaging camera AstraLux. It allows timestamping of individual CCD exposures at frame rat…
AstraLux: the Calar Alto Lucky Imaging Camera
Felix Hormuth, Stefan Hippler, Wolfgang Brandner +2
AstraLux is the Lucky Imaging camera for the Calar Alto 2.2-m telescope, based on an electron-multiplying high speed CCD. By selecting only the best 1-10% of several thousand short…