Resolving Low Energy Lines from LMXRB

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Chandra Proposal Id #01400738

Scientific paper

ASCA observations of the LMXRB X0918-54,X1543-62 and X0614+09 reveal strong emission lines in the 0.5-1 keV band.The emission is consistent with Oxygen and Iron L,but major uncertanties remain in establishing the line emission mechanism.The recombination continuum,a signature of photoinonization,is missing or at lower level in all systems. A collisionial plasma better reproduces the spectrum. Scattering and 3-body recombinations are other possible mechanism that can lower the recombination. Observations with the AXAF HETG of the 3 objects can differentiate line emission with an unprecedented resolving power.This capability will pin-down the underline mechanism responsible for the line emission, and define abundances to constrain the system evolution.

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