  We determine the X-ray spectral properties of a sample of low-mass X-ray
binaries (LMXBs) which reside in globular clusters of M31, as well as five
LMXBs in Galactic globular clusters and in the Large Magellanic Cloud using the
ROSAT PSPC. We find a trend in the X-ray properties of the LMXBs as a function
of globular cluster metallicity. The spectra of LMXBs become progressively
softer as the metallicity of its environment increases. The one M31 globular
cluster LMXB in our sample which has a metallicity greater than solar has
spectral properties similar to those of LMXBs in the bulge of M31, but markedly
different from those which reside in low metallicity globular clusters, both in
M31 and the Galaxy. The spectral properties of this high metallicity LMXB is
also similar to those of X-ray faint early-type galaxies. This lends support to
the claim that a majority of the X-ray emission from these X-ray faint
early-type galaxies results from LMXBs and not hot gas, as is the case in their
X-ray bright counterparts.
