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The X-ray hardness ratio variation in low-mass X-ray binaries

Authors:	Krishna M V Apparao S P Tarafdar

Institution:	(1) Tata Institute of Fundamental Research, Bombay, India

Abstract:	The behaviour of the hardness ratio in low-mass X-ray binaries (LMXRB) indicates that at some value of mass accretion rate $\dot M$ , the X-ray intensity decreases with increasing $\dot M$ . It is suggested here that, at some $\dot M$ , wind from the accretion disk becomes appreciable and depletes the mass accretion on to the neutron star and thus reduces the X-ray intensity. This explains the behaviour of the hardness ratio in LMXRB. Possible implications of this on quasi-periodic oscillations are discussed.

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