115 citations · 1.8k across the 88 of their papers we have counts for
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Spectropolarimetric Variability and Co-Rotating Structure in HD 92207
R Ignace, S Hubrig, M Scholler
We report on low resolution (R~3000) spectropolarimetry of the A0 supergiant star HD 92207. This star is well-known for significant spectral variability. The source was observed on…
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…
New insights into the nature of the peculiar star theta Carinae
S. Hubrig, M. Briquet, T. Morel +3
We acquired high resolution spectroscopic and low resolution spectropolarimetric observations to achieve the following goals: a) to improve the orbital parameters to allow a more i…
VLTI monitoring of the dust formation event of the Nova V1280 Sco
Olivier Chesneau, Dipankar Banerjee, F. Millour +13
We present the first high spatial resolution monitoring of the dust forming nova V1280 Sco performed with the Very Large Telescope Interferometer (VLTI). Spectra and visibilities w…
Evidence for weak magnetic fields in early-type emission stars
S. Hubrig, R. V. Yudin, M. Pogodin +2
We report the results of our study of magnetic fields in a sample of 15 Be stars using spectropolarimetric data obtained at the European Southern Observatory with the multi-mode in…
Establishing the nature of companion candidates to X-ray emitting late B-type stars
S. Hubrig, O. Marco, B. Stelzer +2
The most favored interpretation for the detection of X-ray emission from late B-type stars is that these stars have a yet undiscovered late-type companion (or an unbound nearby lat…
Evolution of Magnetic Fields in Stars Across the Upper Main Sequence: II. Observed distribution of the magnetic field geometry
S. Hubrig, P. North, M. Schoeller
We re-discuss the evolutionary state of upper main sequence magnetic stars using a sample of Ap and Bp stars with accurate Hipparcos parallaxes and definitely determined longitudin…
On the co-existence of chemically peculiar Bp stars, slowly pulsating B stars and constant B stars in the same part of the H-R diagram
M. Briquet, S. Hubrig, P. De Cat +3
Aims. In order to better model massive B-type stars, we need to understand the physical processes taking place in slowly pulsating B (SPB) stars, chemically peculiar Bp stars, and…
Disk and wind interaction in the young stellar object MWC 297 spatially resolved with VLTI/AMBER
F. Malbet, M. Benisty, W. J. De Wit +15
The young stellar object MWC 297 has been observed with the VLT interferometer equipped with the AMBER instrument. MWC 297 has been spatially resolved in the continuum with a visib…
Multiplicity of chemically peculiar stars
S. Hubrig, N. Ageorges, M. Schoeller
Recently, with the goal to study multiplicity of chemically peculiar stars, we carried out a survey of 40 stars using diffraction limited near infrared (IR) imaging with NAOS-CONIC…
Evolution of magnetic fields in stars across the upper main sequence
S. Hubrig, M. Schoeller, P. North
To properly understand the physics of upper main sequence stars it is particularly important to identify the origin of their magnetic fields. Recently, we confirmed that magnetic f…
Evolution of Magnetic Fields in Stars Across the Upper Main Sequence: Results from Recent Measurements with FORS 1 at the VLT
S. Hubrig, P. North, T. Szeifert
We rediscuss the evolutionary state of upper main sequence magnetic stars using a sample of Ap and Bp stars with accurate Hipparcos parallaxes and definitely determined longitudina…
The sub-arcsecond dusty environment of Eta Carinae
O. Chesneau, M. Min, T. Herbst +15
The core of the nebula surrounding Eta Carinae has been observed with the VLT Adaptive Optics system NACO and with the interferometer VLTI/MIDI to constrain spatially and spectrall…
Magnetic fields in Herbig Ae stars
S. Hubrig, M. Schoeller, R. V. Yudin
Herbig Ae stars are young A-type stars in the pre-main sequence evolutionary phase with masses of ~1.5-3 M_o. They show rather intense surface activity (Dunkin et al. 1997) and inf…
Direct measurement of the size and shape of the present-day stellar wind of Eta Carinae
R. van Boekel, P. Kervella, M. Schoeller +7
We present new high angular resolution observations at near-IR wavelengths of the core of the Luminous Blue Variable Eta Carinae, using NAOS-CONICA at the VLT and VINCI at the VLT…
Observations of Mira stars with the IOTA/FLUOR interferometer and comparison with Mira star models
K. -H. Hofmann, U. Beckmann, T. Bloecker +16
We present K'-band observations of five Mira stars with the IOTA interferometer. The interferograms were obtained with the FLUOR fiber optics beam combiner, which provides high-acc…
Measuring starspots on magnetically active stars with the VLTI
M. Wittkowski, M. Schoeller, S. Hubrig +2
We present feasibility studies to directly image stellar surface features, which are caused by magnetic activity, with the Very Large Telescope Interferometer (VLTI). We concentrat…
The angular diameter and distance of the Cepheid Zeta Geminorum
P. Kervella, V. Coude du Foresto, G. Perrin +3
Cepheids are the primary distance indicators for extragalactic astronomy and therefore are of very high astrophysical interest. Unfortunately, they are rare stars, situated very fa…
Observations of Mira stars with the IOTA/FLUOR interferometer and comparison with Mira star models
K. -H. Hofmann, U. Beckmann, T. Bloecker +13
We present K-band observations of five Mira stars with the IOTA interferometer. The interferograms were obtained with the FLUOR fiber optics beam combiner which provides high-accur…