In this figure ak′b is an isothermal, ak″ is the curve for the binary system, and K is the ternary critical point.
In this way we get the freezing point curve Ak1B for the binary system; k1; being an eutectic point.
This star is a binary system and the light of the two components together is about the same as that of Capella (Alpha Aurig).
The star 70 Ophiuchi (fig. 3) may be regarded ...