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Spectral state transitions in neutron star LMXB systems have been widelyobserved yet not well understood. Here we report an abrupt spectral change in4U 1608-52, a typical atoll source, during its decay phase of the 2004outburst. The source is found to undergo sudden changes in its spectralhardness and other properties. The transition occurred when its luminosity isbetween (3.3-5.3) E36 ergs/s, assuming a distance of 3.6 kpc. Interpreting thisevent in terms of the propeller effect, we infer the neutron star surfacemagnetic field as (1.4-1.8) E8 Gauss. We also briefly discuss similarities anddifferences between the spectral states of neutron star and black hole binarysystems.Comment: 13 pages, 3 figures, accepted by Astrophysical Journa

Propeller‐driven Spectral State Transition in the Low‐Mass X‐Ray Binary 4U 1608−52