The effects of metallicity changes on low resolution synthetic spectra
are shown in Figs. 5-8 for models with
and
for the extreme values of the
gravity in our grid. For the higher effective temperature,
Figs. 5 and 6, the effects of metallicity are
most pronounced in the optical (reduced metallicity causes increased
flux due to decreased TiO opacity) and in region from 1 to
m
(the reaction of the atmosphere causes reduced flux in this region to
compensate for the larger flux in the optical). The water band get
stronger with reduced metallicity due to these redistribution
effects. For lower effective temperatures, Figs. 7 and
8, the effects of metallicity of the spectra are
significantly smaller, in particular for the lower gravity shown in
Fig. 7. Here the temperatures are so low that the bands
are saturated and thus will not change much within the range of
metallicities considered here (larger changes will eventually affect
the spectra). Significant changes occur only in localized bands, e.g.,
the metal hydrides and other non-saturated bands such as VO.