Key points are not available for this paper at this time.
Context. The predicted orbital-period distribution of the subdwarf-B (sdB) population is bi-modal with a peak at short (250 days) periods. Observationally, many short-period sdB systems are known, but the predicted long period peak is missing as orbits have only been determined for a few long-period systems. As these predictions are based on poorly understood binary-interaction processes, it is of prime importance to confront the predictions with reliable observational data. We therefore initiated a monitoring program to find and characterize long-period sdB stars.
Vos et al. (Tue,) studied this question.