Optical State Changes of Quiescent X-ray Binaries: Binary Parameters, Distance, and the Accretion Flow

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Scientific paper

We show that X-ray Binaries undergo optical state changes within X-ray quiescence. All states show emission from the accretion flow, but in what we call the "passive" state, we show that it is possible to separate stellar flux from flux due to the accretion flow. We thereby gain a better understanding of both components: We are able to robustly determine binary parameters and distance from the stellar component, while finding new observational constraints on the nature of the accretion flow. We focus on the black hole Binary A0620--00. By accounting for the accretion flow, we improve the uncertainty in its inclination by a factor of 20, the uncertainty in its mass by a factor of 40, and the uncertainty in its distance by a factor of 10. We are optimistic that our methods will produce similar improvements in other systems. This work was supported by NSF Graduate Research Fellowship DGE-0202738 to AGC and NSF/AST grants 0407063 and 0707627 to CDB.

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