MUSE library of stellar spectra
  Empirical stellar spectral libraries have applications in both extragalactic
and stellar studies, and they have an advantage over theoretical libraries
because they naturally include all relevant chemical species and physical
processes. During recent years we see a stream of new high quality sets of
spectra, but increasing the spectral resolution and widening the wavelength
coverage means resorting to multi-order echelle spectrographs. Assembling the
spectra from many pieces results in lower fidelity of their shapes. We aim to
offer the community a library of high signal-to-noise spectra with reliable
continuum shapes. Furthermore, the using an integral field unit (IFU)
alleviates the issue of slit losses. Our library was build with the MUSE
(Multi-Unit Spectroscopic Explorer) IFU instrument. We obtained spectra over
nearly the entire visual band (lambda~4800-9300 Ang). We assembled a library of
35 high-quality MUSE spectra for a subset of the stars from the X-shooter
Spectral Library. We verified the continuum shape of these spectra with
synthetic broad band colors derived from the spectra. We also report some
spectral indices from the Lick system, derived from the new observations. We
offer a high-fidelity set of stellar spectra that covers the
Hertzsprung-Russell diagram. It can be useful for both extragalactic and
stellar work and demonstrates that the IFUs are excellent tools for building
reliable spectral libraries.
