Gruis, taken from six plates of the same dispersion, and comparable quality, density, and definition. Successive columns give the wave-length, the arithmetic mean intensity, and the standard deviation
.
[TABLEXVIII]
| Line | Int. | Line | Int. | Line | Int. | Line | Int. | ||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| 4215 | 8.4 | 1.0 | 4319 | 4.8 | 0.8 | 4376 | 7.8 | 0.6 | 4451 | 4.5 | 1.5 |
| 4227 | 16.0 | 1.4 | 4321 | 4.0 | 0.0 | 4379 | 4.2 | 0.3 | 4455 | 5.0 | 1.0 |
| 4247 | 6.0 | 0.0 | 4326 | 10.4 | 0.5 | 4383 | 10.3 | 0.8 | 4462 | 6.0 | 0.8 |
| 4250 | 7.0 | 0.0 | 4330 | 4.6 | 0.8 | 4395 | 6.3 | 0.4 | 4482 | 7.7 | 0.7 |
| 4254 | 9.0 | 1.0 | 4332 | 3.6 | 0.5 | 4398 | 2.7 | 0.8 | 4490 | 7.3 | 0.4 |
| 4260 | 9.0 | 2.1 | 4333 | 4.0 | 0.0 | 4402 | 6.3 | 0.4 | 4495 | 7.5 | 0.4 |
| 4272 | 8.7 | 0.8 | 4337 | 8.7 | 0.8 | 4405 | 9.0 | 0.5 | 4502 | 6.0 | 0.0 |
| 4275 | 9.5 | 1.3 | 4340 | 9.5 | 1.1 | 4409 | 9.0 | 0.5 | 4554 | 5.3 | 0.4 |
| 4283 | 4.3 | 0.4 | 4352 | 9.2 | 1.1 | 4415 | 7.7 | 0.8 | 4564 | 5.8 | 0.7 |
| 4290 | 10.6 | 1.0 | 4360 | 6.8 | 1.0 | 4435 | 9.2 | 0.9 | 4572 | 6.0 | 1.0 |
| 4315 | 8.3 | 0.7 | 4370 | 6.8 | 0.6 | 4444 | 8.9 | 1.2 |
These measures are strictly representative of the material as a whole, for the plates of
Gruis were measured at wide intervals in the ordinary course of the work, and were selected for illustration because there was a greater number of suitable plates of this star than for any other.
HOMOGENEITY OF MATERIAL
The observational material on line-intensities follows in tabular form. The measures were made in two groups, comprising respectively the hotter stars and the stars cooler than Class