Using the high-resolution Echelle spectrograph UVES
(Dekkeret al. 2000)
at the VLT, we carried out
spectroscopic observations of nine
bona fide and candidate brown dwarfs (M6-M8)
(ChaH1 to 8 and 12)
and three mid-M-type T Tauri stars (B34, CHXR74 and Sz23)
in ChaI between March and May 2000.
For each object at least
two spectra separated by a few weeks have been obtained.
UVES is ideal for high precision measurements of
RVs of faint objects.
The spectra have been taken using the red arm of the two-armed UVES
spectrograph equipped with a mosaic of two CCDs (blue side of red arm: EEV;
red side of red arm: MIT-LL).
The wavelength coverage is 6600Å to 10400 Å and
the spectral resolution
.
The spectra have been taken with a slit of 1
to 1.2
during a seeing of 0.4
to 1.0
.
The spectra have been optimally extracted, including bias correction,
flat fielding, cosmic ray elimination and sky subtraction using the Echelle
package of IRAF.
Copyright ESO 2001