# The mass function of GX 339-4 from spectroscopic observations of its donor star

@article{Heida2017TheMF,
title={The mass function of GX 339-4 from spectroscopic observations of its donor star},
author={Marianne Heida and Peter G. Jonker and Manuel A P Torres and Andrea Chiavassa},
journal={arXiv: High Energy Astrophysical Phenomena},
year={2017}
}
• M. Heida, +1 author A. Chiavassa
• Published 15 August 2017
• Physics
• arXiv: High Energy Astrophysical Phenomena
We obtained 16 VLT/X-shooter observations of GX 339-4 in quiescence in the period May - September 2016 and detected absorption lines from the donor star in its NIR spectrum. This allows us to measure the radial velocity curve and projected rotational velocity of the donor for the first time. We confirm the 1.76 day orbital period and we find that $K_2$ = $219 \pm 3$ km s$^{-1}$, $\gamma = 26 \pm 2$ km s$^{-1}$ and $v \sin i = 64 \pm 8$ km s$^{-1}$. From these values we compute a mass function… Expand

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