In 1975, Yasuho Yamashita noted that some higher temperature carbon stars displayed the typical spectral characteristics of a CH star, but did not have the same kinematic properties. That is, they did not have the higher space velocities characteristic of the older stellar population. These were dubbed CH-like stars.[3] Many CH stars are known to be members of binary star systems, and it is reasonable to believe this is (or was) the case for all CH stars.