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We propose a simplified picture of low mass X-ray binaries containing aneutron star (NS-LMXBs) based on data obtained from AqlX-1 and 4U1608-52 whichoften produce outbursts. In this picture we propose at least three states andthree state transitions; i.e., the states: (1) soft state, (2) hard-high state,and (3) hard-low state, and the state transitions: (i) hard-high state to softstate, (ii) soft state to hard-high state, and (iii) hard-high state tohard-low state or vice versa. Gases from the accretion disc of an NS-LMXBpenetrate almost the entire magnetic field and accrete onto the neutron star incases (1) and (2), whereas in case (3) some gases accrete around the magneticpoles in a manner resembling the behavior of an X-ray pulsar, and considerablegas is dispersed or ejected by the propeller effect. Transition (iii) occurswhen the Alfv\'{e}n radius is equal to the co-rotation radius. Therefore, inthis case, it is possible to estimate the strength of the neutron star'smagnetic field by detecting transition (iii). We also discuss the no-accretionX-ray state or recycled pulsar state, in which the Alfv\'{e}n radius is largerthan the light cylinder radius.

Simplified Picture of Low Mass X-ray Binaries based on Data from Aql X-1 and 4U1608-52