HR-pyPopStar: high wavelength-resolution stellar populations
  evolutionary synthesis model
  We present the HR-pyPopStar model, which provides a complete set (in ages) of
high resolution (HR) Spectral Energy Distributions of Single Stellar
Populations. The model uses the most recent high wavelength-resolution
theoretical atmosphere libraries for main sequence, post-AGB/planetary nebulae
and Wolf-Rayet stars. The Spectral Energy Distributions are given for more than
a hundred ages ranging from 0.1 Myr to 13.8 Gyr, at four different values of
the metallicity (Z = 0.004, 0.008, 0.019 and 0.05), considering four different
IMFs. The wavelength range goes from 91 to 24 000 {\AA} in linear steps
{\delta}{\lambda} = 0.1 {\AA}, giving a theoretical resolving power R_{th,5000}
~ 50 000 at 5000 {\AA}. This is the main novelty of these spectra, unique for
their age and wavelength ranges. The models include the ionising stellar
populations that are relevant both at young (massive hot stars) as well as old
(planetary nebulae) ages. We have tested the results with some examples of HR
spectra recently observed with MEGARA at GTC. We highlight the importance of
wavelength-resolution in reproducing and interpreting the observational data
from the last and forthcoming generations of astronomical instruments operating
at 8-10m class telescopes, with higher spectral resolution than their
predecessors.
