The quasi-resonant variability of the massive LMC system BI 108
Zbigniew Ko{\l}aczkowski, Ronald Mennickent, Thomas Rivinius and, Grzegorz Pietrzy\'nski
TL;DR
This study investigates the unique photometric variability of the LMC star BI 108, revealing a quadruple system with two massive B1 supergiants in a resonant orbital configuration.
Contribution
It provides spectroscopic evidence for a quadruple system with resonant orbital periods, explaining the star's peculiar light curve.
Findings
Spectroscopic detection of a SB2 system of two B1 supergiants.
Identification of a 5.366-day orbital period.
Evidence supporting a quadruple system hypothesis.
Abstract
The early B supergiant LMC star BI 108 is photometrically variable with a unique light curve; two strong periods are present in an almost precise 3:2 resonance. We collected spectroscopic data at VLT/UVES, sampling the supercycle of 10.733 days in ten epochs. We find spectral signatures for a SB2 system consisting of two massive B1 supergiants orbiting at the orbital period of 5.366 days. The shorter periodicity resembles the light curve of an eclipsing binary with periodicity 3.578 days that is not detected in the data. We discuss possible causes for the short periodicity and conclude that the quadruple system is the more plausible hypothesis.
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