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

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Accretion Disks, Neutron Stars, Radiation Hardening, Stellar Mass Accretion, X Ray Binaries, Stellar Coronas, Stellar Mass, Stellar Oscillations, Stellar Winds

Scientific paper

The behavior of the hardness ratio in low-mass X-ray binaries (LMXRB) indicates that at some value of mass accretion rate (MAR), the X-ray intensity decreases with increasing MAR. It is suggested here that, at some MAR, 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 behavior of the hardness ratio in LMXRB. Possible implications of this on quasi-periodic oscillations are discussed.

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