Part 1 — TABLE V

Class Wilsing Rosenberg E.S. King Color Temperature E.S. King Total Radiation

12300° 30000° 22700° 22700°

11450 18000 15200 14900

10250 1200 11600 11300

9000 9000 8800 8600

7950 7850 7900 7700

6880 6930 7000 6800

5980 6000 6040 5870

5250 5200 5090 4950

4570 4570 4570 4440

3860 3840 3640 3550

3550 3580 3430 3340

It is seen that the effective temperatures of individual hotter stars vary widely among themselves. This is largely a result of the difficulty of making the appropriate correction for atmospheric extinction. It must, then, be supposed that the temperatures derived by spectrophotometric methods are not trustworthy for stars hotter than Class . The values determined by the earlier observers for the and classes are almost certainly too low. Rosenberg’s value of 30,000° for is, however, most probably too high, as will be inferred later from the ionization temperature scale.

For the cooler stars small discrepancies also occur among the different observers. In the writer’s opinion, the lowest estimates for the temperatures of the cooler stars are probably nearest to the truth.