# The binary evolution of SAX J1808.4−3658: implications of an evolved donor star

@article{Goodwin2020TheBE,
title={The binary evolution of SAX J1808.4−3658: implications of an evolved donor star},
author={Adelle Goodwin and T. E. Woods School of Physics and Astronomy and Monash University and National Research Council Canada and Herzberg AstronomyAstrophysics Research Centre},
journal={Monthly Notices of the Royal Astronomical Society},
year={2020}
}
• Published 6 March 2020
• Physics
• Monthly Notices of the Royal Astronomical Society
Observations of the accretion powered millisecond pulsar SAX J1808.4−3658 have revealed an interesting binary evolution, with the orbit of the system expanding at an accelerated rate. We use the recent finding that the accreted fuel in SAX J1808.4−3658 is hydrogen depleted to greatly refine models of the progenitor and prior evolution of the binary system. We constrain the initial mass of the companion star to 1.0–1.2 M⊙, more massive than previous evolutionary studies of this system have…
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