Time series of optical spectra of Nova V659 Sct
  With our robotic 1.2 m TIGRE telescope, we were able to obtain eight optical
spectra with intermediate resolution (R = 20,000) of the Nova V659 Sct during
different phases of its outburst. We present a list of the lines found in the
Nova spectra. The most common features are H I, O I, Na I, Fe II and Ca II.
Studying the spectral evolution of the strong features we found that the
absorption features move to higher expansion velocities before disappearing and
the emission features show (different) asymmetries. Thanks to the intermediate
spectral resolution we identified and analysed the interstellar medium
absorption features present in the spectra. We detected atomic absorption
features of Na I and Ca II. The sodium D lines show more complex substructures
with three main absorption features at around a velocity of -10, 30 and 85
km/s. We identified several DIBs in the Nova V659 Sct spectra and determined
their velocities and equivalent widths.
