A systematic search for the spectra with features of crystalline
  silicates in the Spitzer IRS Enhanced Products
  The crystalline silicates features are mainly reflected in infrared bands.
The Spitzer Infrared Spectrograph (IRS) collected numerous spectra of various
objects and provided a big database to investigate crystalline silicates in a
wide range of astronomical environments. We apply the manifold ranking
algorithm to perform a systematic search for the spectra with crystalline
silicates features in the Spitzer IRS Enhanced Products available. In total,
868 spectra of 790 sources are found to show the features of crystalline
silicate. These objects are cross-matched with the SIMBAD database as well as
with the Large Sky Area Multi-Object Fibre Spectroscopic Telescope
(LAMOST)/DR2. The average spectrum of young stellar objects show a variety of
features dominated either by forsterite or enstatite or neither, while the
average spectrum of evolved objects consistently present dominant features of
forsterite in AGB, OH/IR, post-AGB and planetary nebulae. They are identified
optically as early-type stars, evolved stars, galaxies and so on. In addition,
the strength of spectral features in typical silicate complexes is calculated.
The results are available through CDS for the astronomical community to further
study crystalline silicate.
