The are still orbital distribution for periods longer than 10000 days and the G-K red giant binaries that evolved into strong barium stars are dense in the region of short periods.

• (a) 能演化成弱钡星系统的红巨星双星系统的周期的对数分布得比较均匀,在大周期(大于10000天)范围仍有分布,而能演化成强钡星系统的红巨星双星系统的分布在短周期区密集。