4.7 Article

Are the very faint X-ray transients period gap systems?

Journal

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 428, Issue 2, Pages 1335-1340

Publisher

OXFORD UNIV PRESS
DOI: 10.1093/mnras/sts113

Keywords

accretion, accretion discs; binaries: close; stars: late-type; stars: mass-loss; X-rays: binaries

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We discuss a scenario for the very faint X-ray transients as X-ray binaries fed by winds from detached M dwarf donors in binary stars within the 'period gap' - the range of periods where donor stars have become fully convective, and shrunken so that they no longer fill their Roche lobes, but have not yet re-attached due to the systems shrinking through gravitational radiation. This wind-fed detached binary scenario can reproduce the two key properties of the very faint X-ray transients - their faintness, which defines them, and their relatively low duty cycle outbursts which require that they have low mean mass transfer rates. We discuss feasible observational tests of the scenario.

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