stars are often the finest and sharpest lines in the spectrum. This behavior suggests a high-level origin, but “stationary Strontium,” although suggested by Plaskett[332] as likely to occur, has not yet been observed.
YTTRIUM (39)
Numerous lines of yttrium[333] are found in the solar spectrum. The lines of the ionized atom are somewhat stronger than the lines of the neutral atom. The lines of the neutral element which can be identified in the solar spectrum are contained in the following table.
[TABLE XV]
| Series | Wave-Lenght | Int. | Attribution | Int. | Wave-Lenght |
|---|---|---|---|---|---|
| 3620.94 | 20 | Y? | 00 | 3621.110 | |
| 3592.91 | 10 | Y | 0 | 3593.040 | |
| 3552.69 | 3 | - | - | ||
| 4128.32 | 30 | 00 | 4128.46 | ||
| 4039.83 | 5 | Y | 00 | 4040.013 | |
| 4047.65 | 8 | Y | 4047.823 | ||
| 4102.38 | 20 | Y | 0 | 4102.541 | |
| 4167.52 | 10 | 00 | 4167.737 | ||
| 4077.39 | 20 | La, Y | ? | 4077.498 |
The multiplets
at 4174, etc., and
at 4674, etc., and the