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.
Yasuho Yamashita pointed out in 1975 that certain hotter carbon stars showed the usual spectral traits of a CH star, yet did not possess the higher space velocities typical of the more ancient stellar population.