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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…
Milliarcsecond angular resolution of reddened stellar sources in the vicinity of the Galactic Center. II. Additional observations
A. Richichi, O. Fors, E. Mason
We present lunar occultation observations obtained in August 2006 with the recently demonstrated burst mode of the ISAAC instrument at the ESO VLT. The results presented here follo…
Milliarcsecond angular resolution of reddened stellar sources in the vicinity of the Galactic Center
A. Richichi, O. Fors, E. Mason +2
For the first time, the lunar occultation technique has been employed on a very large telescope in the near-IR with the aim of achieving systematically milliarcsecond resolution on…
Life on the fast lane: the burst mode at the VLT at present and in the future
A. Richichi, O. Fors, E. Mason +3
The recent implementation of the high-speed burst mode at the ISAAC instrument on UT1, and its propagation to other ESO instruments, has opened the door to observational capabiliti…
A new wavelet-based approach for the automated treatment of large sets of lunar occultation data
O. Fors, A. Richichi, X. Otazu +1
The introduction of infrared arrays for lunar occultations (LO) work and the improvement of predictions based on new deep IR catalogues have resulted in a large increase in the num…
The molecular and dusty composition of Betelgeuse's inner circumstellar environment
Guy Perrin, Tijl Verhoelst, Stephen T. Ridgway +6
The study of the atmosphere of red supergiant stars in general and of Betelgeuse (alpha Orionis) in particular is of prime importance to understand dust formation and how mass is l…
First direct detection of a Keplerian rotating disk around the Be star Arae using the VLTI/AMBER instrument
Anthony Meilland, Philippe Stee, Martin Vannier +9
Aims. We aim to study the geometry and kinematics of the disk around the Be star Arae as a function of wavelength, especially across the Br emission line. The main purpose o…
VLTI/AMBER and VLTI/MIDI spectro-interferometric observations of the B[e] supergiant CPD-57 2874
A. Domiciano de Souza, T. Driebe, O. Chesneau +11
We present the first high spatial and spectral observations of the circumstellar envelope (CSE) of a B[e] supergiant (CPD), performed with the Very Large Telescope Interf…
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…
The Calar Alto lunar occultation program: update and new results
A. Richichi, O. Fors, M. Merino +6
We present an update of the lunar occultation program which is routinely carried out in the near-IR at the Calar Alto Observatory. A total of 350 events were recorded since our las…
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…
Observing the Seyfert 2 nucleus of NGC 1068 with the VLT Interferometer
Huub Rottgering, Walter Jaffe, Klaus Meisenheimer +4
Dusty tori have been suggested to play a crucial role in determining the physical characteristics of active galactic nuclei (AGN), but investigation of their properties has stalled…
First results from the ESO VLTI Calibrators Program
A. Richichi, I. Percheron
The ESO Very Large Telescope Interferometer (VLTI) is one of the leading interferometric facilities. It is equipped with several 8.2 and 1.8m telescopes, a large number of baseline…
First VLTI/MIDI observations of a Be star: Alpha Ara
Olivier Chesneau, A. Meilland, T. Rivinius +12
We present the first VLTI/MIDI observations of the Be star Alpha Ara, showing a nearly unresolved circumstellar disk in the N band. The interferometric measurements made use of the…
Calibration Observations of Fomalhaut with the VLTI
J. Davis, A. Richichi, P. Ballester +6
An investigation of the stability of the transfer function of the European Southern Observatory's Very Large Telescope Interferometer has been carried out through observations of F…
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…
Infrared and visual lunar occultations measurements of stellar diameters and new binary stars detections at the Calar Alto 1.5m telescope
O. Fors, A. Richichi, J. Nunez +1
We present a program of routine lunar occultations, at optical and near-IR wavelengths, recently started at the 1.5m Spanish telescope at the Calar Alto Observatory. Both a CCD and…
CCD drift-scan imaging lunar occultations: a feasible approach for sub-meter class telescopes
O. Fors, J. Nunez, A. Richichi
A CCD drift-scanning technique for lunar occultation (LO) observations is presented. While this approach has been addressed before by Sturmann (1994) for the case of large telescop…
Resolving gravitational microlensing events with long-baseline optical interferometry. Prospects for the ESO Very Large Telescope Interferometer
F. Delplancke, K. M. Gorski, A. Richichi
Until now, the detailed interpretation of the observed microlensing events has suffered from the fact that the physical parameters of the phenomenon cannot be uniquely determined f…
Near-infrared photometry of the intermediate age open clusters IC 166 and NGC 7789
Antonella Vallenari, Giovanni Carraro, Andrea Richichi
We present and discuss new photometric data obtained with an IR camera in the J and K pass-bands for the intermediate age open clusters IC 166 (936 stars in total) and NGC 7789 (10…
Discovery of a close companion to the young star Haro 6-37
A. Richichi, R. Koehler, J. Woitas +1
We report lunar occultation (LO) and speckle interferometry observations of Haro 6-37, all carried out at lambda=2.2 microns. The main finding is the discovery of a new close compa…
Near IR photometry of the old open clusters Berkeley 17 and Berkeley 18. Probing the age of the galactic disc
Giovanni Carraro, Antonella Vallenari, Leo Girardi +1
We report on near IR ( and bands) observations of two regions centered on the old open clusters Berkeley~17 and Berkeley~18, for which only optic…
Detection of a sub-arcsecond dust shell around the Wolf-Rayet star WR 112
S. Ragland, A. Richichi
A lunar occultation event of the Wolf-Rayet star WR 112 (type WC9) has been observed simultaneously from two independent telescopes at lambda = 2.2microns, allowing us to investiga…