New Observations and Analysis of the Bright Semi-Detached Eclipsing Binary mu1 Sco
C. van Antwerpen (Flinders University), T. Moon (University of, Sydney)
TL;DR
This study combines 70 years of photometric data and spectroscopic analysis to refine the orbital parameters and system configuration of the bright semi-detached eclipsing binary mu1 Sco, revealing the secondary nearly fills its Roche lobe.
Contribution
The paper provides a new, comprehensive system solution for mu1 Sco using combined photometric and spectroscopic data, updating the orbital period and epoch.
Findings
Refined orbital period of 1.44627 days.
Adjusted epoch of primary minimum to HJD 2449534.17700.
Secondary star is close to filling its Roche lobe.
Abstract
Using new and published photometric observations of mu1 Sco (HR 6247), spanning 70 years, a period of 1.4462700(5) days was determined. It was found that the epoch of primary minimum suggested by Shobbrook at HJD 2449534.178 requires an adjustment to HJD 2449534.17700(9) to align all the available photometric datasets. Using the resulting combined-data light-curve, radial velocities derived from IUE data and the modelling software PHOEBE, a new system solution for this binary was obtained. It appears that the secondary is close to, or just filling, its Roche-lobe.
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