 The A1/A2 and B1/B2 pairs take no more than 25 years to orbit each other, while the A pair completes an orbit around each other every 20.7 days and the B pair every 6.0 days.The system is bright at x-ray wavelengths primarily due to colliding stellar winds in the two close pairs.Pair A1/A2 contributes the bulk of the x-ray luminosity.