The orbit of the close spectroscopic binary ε Lup and the intrinsic variability of its early B-type components ,

@article{Uytterhoeven2005TheOO,
  title={The orbit of the close spectroscopic binary $\epsilon$ Lup and the intrinsic variability of its early B-type components ,},
  author={Katrien Uytterhoeven and P. Harmanec and John H. Telting and Conny Aerts},
  journal={Astronomy and Astrophysics},
  year={2005},
  volume={440},
  pages={249-260}
}
We subjected 106 new high-resolution spectra of the double-lined spectroscopic close binary e Lup, obtained in a time-span of 17 days from two different observatories, to a detailed study of orbital and intrinsic variations. We derived accurate values of the orbital parameters. We refined the sidereal orbital period to 4. 55970 days and the eccentricity to e = 0.277. By adding old radial velocities, we discovered the presence of apsidal motion with a period of the rotation of apses of about 430… 
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