The Atlas consists of 711 sets of data. Each set contains a description which specifies the main spectrum parameters, i.e. temperature, surface gravity, chemical composition and microturbulence of the parent model, wavelength range, resolving power, etc. Then, for each wavelength point, both the continuum and the line blanketed absolute fluxes per unit frequency (erg cm-2 s-1 Hz-1) are given allowing the computation of residual intensities. The Atlas is published electronically at the CDS.
Figure 5:
Effects of different atmosphere parameter values
in the Mgb
region: spectra computed for 
K (left) and
K (right) at [M/H]=+0.0 (top) and [M/H]=+0.5
(bottom) are plotted. The solid line
corresponds to 
, and the dotted line to log g=4.0
Figure 6:
Sequence in temperature of spectra
representative of solar chemical composition stars of intermediate
surface gravity 
dex)
Figure 7:
Sequence in temperature of spectra
representative of solar chemical composition dwarfs 
dex)
A subset of the spectral Atlas is displayed in Figs. 5 (click here), 6 (click here) and 7 (click here). Figure 5 (click here) illustrates the behaviour of the spectra in the Mgb region for different temperatures, metallicities, and surface gravities.
The general trend of the spectra in the whole wavelength range is depicted
in Figs. 6 (click here) and 7 (click here). The spectra are plotted in an absolute flux scale after
a degradation in resolution (
) to increase the readability of the
figures.
Figures 6 (click here) and 7 (click here) contain sequences in temperatures of spectra
representative of solar chemical composition stars of intermediate and high
surface gravity, 3.0dex and 4.5dex, respectively.
Figures 5 (click here) to 7 (click here) show that our Atlas can serve as a starting point both for high and for intermediate resolution analyses. In fact, the availability of synthetic spectra at high resolution makes it possible to simulate the effects of any instrumental profile.
Acknowledgements
This work was partially supported by the Ministero dell'Università e della Ricerca Scientifica e Tecnologica (60% and 40% grants), and by the Consiglio Nazionale delle Ricerche (CNR-GNA).