# The Origins of X-ray Line Emissions in Circinus~X-1 at Very Low X-ray Flux

@inproceedings{Schulz2020TheOO,
title={The Origins of X-ray Line Emissions in Circinus~X-1 at Very Low X-ray Flux},
author={Norbert S. Schulz and T. R. Kallman and Sebastian Heinz and Patrick Sell and P. Jonker and William N. Brandt},
year={2020}
}
• Norbert S. Schulz, +3 authors William N. Brandt
• Published 2020
• Physics
• Accretion conditions and morphologies of X-ray transients containing neutron stars are still poorly understood. Circinus X-1 is an enigmatic case where we observe X-ray flux changes covering four orders of magnitude. We observed Circinus X-1 several times at its very lowest X-ray flux using the high energy transmission grating spectrometer on board the Chandra X-ray Observatory. At a flux of 1.8$\times10^{-11}$ \ergcm we observed a single 1.6 keV blackbody spectrum. The observed continuum… CONTINUE READING

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