F. Malbet (Observatoire de Grenoble), Chair
G. Perrin (Observatoire de Paris-Meudon),
R. Petrov (Université de Nice),
A. Richichi (Osservatorio Astrofisico di Arcetri),
M. Schöller (Max-Planck-Institut für Radioastronomie, Bonn)
Date: 9 July 1997
We have studied a concept for an imaging and spectroscopic focal instrument for VLTI, AMBER (Astronomical Multiple BEam Recombiner). This instrument complies with the ISAC 1996 recommendations , the revised ESO implementation plan  and the tripartite agreement .
The identified primary science objectives are:
study of the inner 1 parsec of active galactic nuclei
direct detection of massive extrasolar planets
study of the circumstellar environment in star forming regions
multiple objects, fundamental stellar astrophysics.
The main characteristics of this instrument are:
design of a 3-way beam combiner
spatial filtering and accurate visibility calibration
high optical throughput thanks to adaptive optics
early operation with 2 UTs in 2000 in the near-infrared (1-2.5 microns)
spectral resolution up to 10000
spectral extension toward the red when ATs will be available (0.6-2.5 microns).
This report reviews the scientific and technical requirements of the instrument (chapter 1), the optical concept of the beam combiner (chapter 2), the list of instrument subsystems (chapter 3) and observing procedures and data reduction needs (chapter 4). Chapter 5 presents the anticipated performance of AMBER.