157 citations · 3.2k across the 97 of their papers we have counts for
39 papers · 1 filter
The origin of hydrogen line emission for five Herbig Ae/Be stars spatially resolved by VLTI/AMBER spectro-interferometry
S. Kraus, K. -H. Hofmann, M. Benisty +14
To trace the accretion and outflow processes around YSOs, diagnostic spectral lines such as the BrG 2.166 micron line are widely used, although due to a lack of spatial resolution,…
VSI: the VLTI spectro-imager
F. Malbet, D. Buscher, G. Weigelt +51
The VLTI Spectro Imager (VSI) was proposed as a second-generation instrument of the Very Large Telescope Interferometer providing the ESO community with spectrally-resolved, near-i…
Wolf-Rayet stars probed by AMBER/VLTI
Florentin Millour, Olivier Chesneau, Thomas Driebe +5
Massive stars deeply influence their surroundings by their luminosity and the injection of kinetic energy. So far, they have mostly been studied with spatially unresolved observati…
Spatially resolved dusty torus toward the red supergiant WOH G64 in the Large Magellanic Cloud
Keiichi Ohnaka, Thomas Driebe, Karl-Heinz Hofmann +2
We present N-band spectro-interferometric observations of the red supergiant WOH G64 in the Large Magellanic Cloud (LMC) using MIDI at the Very Large Telescope Interferometer (VLTI…
Visual/infrared interferometry of Orion Trapezium stars: Preliminary dynamical orbit and aperture synthesis imaging of the Theta 1 Orionis C system
S. Kraus, Y. Y. Balega, J. -P. Berger +10
Located in the Orion Trapezium cluster, Theta 1 Orionis C is one of the youngest and nearest high-mass stars (O5-O7) and also known to be a close binary system. Using new multi-epo…
Outflows from the high-mass protostars NGC 7538 IRS1/2 observed with bispectrum speckle interferometry -- Signatures of flow precession
S. Kraus, Y. Balega, M. Elitzur +6
NGC 7538 IRS1 is a high-mass (approx. 30 M_sun) protostar with a CO outflow, an associated UCHII region, and a linear methanol maser structure, which might trace a Keplerian-rotati…
Bispectrum speckle interferometry of the massive protostellar outflow source IRAS 23151+5912
G. Weigelt, H. Beuther, K. -H. Hofmann +5
We present bispectrum speckle interferometry of the massive protostellar object IRAS 23151+5912 in the near-infrared K' band. The reconstructed image shows the diffuse nebulosity n…
The vicinity of the galactic supergiant B[e] star CPD -57 2874 from near- and mid-IR long baseline spectro-interferometry with the VLTI (AMBER and MIDI)
A. Domiciano de Souza, T. Driebe, O. Chesneau +8
We present the first spectro-interferometric observations of the circumstellar envelope (CSE) of a B[e] supergiant (CPD -57 2874), performed with the Very Large Telescope Interfero…
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…
High angular resolution N-band observation of the silicate carbon star IRAS08002-3803 with the VLTI/MIDI instrument
Keiichi Ohnaka, T. Driebe, K. -H. Hofmann +10
We present the results of N-band spectro-interferometric observations of the silicate carbon star IRAS08002-3803 with the MID-infrared Interferometric instrument (MIDI) at the Very…
AMBER : a near infrared focal instrument for the VLTI
Romain G. Petrov, Fabien Malbet, Andrea Richichi +3
AMBER is the General User near-infrared focal instrument of the Very Large Telescope interferometer. Its specifications are based on three key programs on Young Stellar Objects, Ac…
Disentangling the wind and the disk in the close surrounding of the young stellar object MWC297 with AMBER/VLTI
Fabien Malbet, M. Benisty, W. J. De Wit +13
The young stellar object MWC297 is a B1.5Ve star exhibiting strong hydrogen emission lines. This object has been observed by the AMBER/VLTI instrument in 2-telescope mode in a sub-…
A quasi-time-dependent radiative transfer model of OH104.9+2.4
D. Riechers, Y. Balega, T. Driebe +4
We investigate the pulsation-phase dependent properties of the circumstellar dust shell (CDS) of the OH/IR star OH104.9+2.4 based on radiative transfer modeling (RTM) using the cod…
Close binary companions of the HAeBe stars LkHa 198, Elias 1, HK Ori and V380 Ori
K. W. Smith, Y. Y. Balega, W. J. Duschl +5
We present diffraction-limited bispectrum speckle interferometry observations of four well-known Herbig Ae/Be (HAeBe) stars, LkHa 198, Elias 1, HK Ori and V380 Ori. For two of thes…
High-resolution near-infrared speckle interferometry and radiative transfer modeling of the OH/IR star OH 104.9+2.4
D. Riechers, Y. Balega, T. Driebe +3
We present near-infrared speckle interferometry of the OH/IR star OH 104.9+2.4 in the K' band obtained with the 6m telescope of the Special Astrophysical Observatory (SAO). At a wa…
Bipolar outflow on the Asymptotic Giant Branch - the case of IRC+10011
D. Vinkovic, Th. Bloecker, K. -H. Hofmann +2
Near-IR imaging of the AGB star IRC+10011 (= CIT3) reveals the presence of a bipolar structure within the central ~0.1 arcsec of a spherical dusty wind. We show that the image asym…
Interferometric observations of the Mira star o Ceti with the VLTI/VINCI instrument in the near-infrared
H. C. Woodruff, M. Eberhardt, T. Driebe +9
We present K-band commissioning observations of the Mira star prototype o Cet obtained at the ESO Very Large Telescope Interferometer (VLTI) with the VINCI instrument and two sider…
Evidence for bipolar jets in late stages of AGB winds
D. Vinkovic, M. Elitzur, K. -H. Hofmann +1
Bipolar expansion at various stages of evolution has been recently observed in a number of AGB stars. The expansion is driven by bipolar jets that emerge late in the evolution of A…
Speckle interferometry of the HAeBe star V376 Cas
K. Smith, Y. Balega, K. -H. Hofmann +3
We report H- and K'-band speckle interferometric observations of the HAeBe star V376 Cas. Our observations show that the object is partially resolved. The visibility curves suggest…
Bispectrum speckle interferometry of the B[e] star MWC 349A
K. -H. Hofmann, Y. Balega, N. R. Ikhsanov +2
We present the results of bispectrum speckle interferometry of the B[e] star MWC 349A obtained with the SAO 6m telescope. Our diffraction-limited J-, H-, and K-band images (resolut…
Spectral Observations of Stars in Late Stages of Stellar Evolution
T. Bloecker, K. -H. Hofmann, G. Weigelt
Interferometric observations of stars in late stages of stellar evolution and the impact of VLTI observations are discussed. Special attention is paid to the spectral information t…
IRC+10216 in Action: Present Episode of Intense Mass-Loss Reconstructed by Two-Dimensional Radiative Transfer Modeling
Alexander B. Men'shchikov, Karl-Heinz Hofmann, Gerd Weigelt
We present two-dimensional (2D) radiative transfer modeling of IRC+10216 at selected moments of its evolution in 1995-2001, which correspond to three epochs of our series of 8 near…
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…
Bispectrum speckle interferometry of IRC+10216: the dynamic evolution of the innermost circumstellar environment from 1995 to 2001
G. Weigelt, Y. Y. Balega, T. Bloecker +3
We present new near-infrared (JHK) bispectrum speckle-interferometry monitoring of the carbon star IRC+10216 obtained between 1999 and 2001 with the SAO 6m telescope. The J-, H-, a…