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Using GX 3+1 as an example of a bright Atoll, GX 5-1 as an exampl e of a Z source, and GX 13+1 as a peculiar hybrid, we take a look at the spectral and lo ng-term time evolution differences in these three neutron star Low-Mass X-ray Binaries represe nting different subtypes. We utilize a recently developed spectral model based on mixed thermal a nd bulk motion Comptonization of soft seed photons from the accretion disc and the neutron s ar surface. The hard X-ray tails exhibited by GX 5-1 and GX 13+1 are attributed to efficient bul k motion Comptonization, which is not present in GX 3+1 due to too low or too high a local accret ion rate. Accreting well below the Eddington limit also enables GX 3+1 to exhibit amplitude modulation presumably due to changes in the accretion output from the companion star, vis ible in theRXTE/ASM light curve on a time scale of ∼6 years.

A comparison between the spectral and long term timing properties of GX 3+1, GX 5-1 and GX 13+1