The lines of ionized titanium come to a maximum at about Class
, but a significant maximum is difficult to determine, for the lines are extremely sensitive to absolute magnitude. Menzel,[297] using
Cassiopeiae (classed by him as
) for his typical star, found a maximum development of lines in that star. The present writer,[298] using the wider selection of stars enumerated in the appendix, obtains
as the maximum for Ti+. A glance at the measures[299] will indicate that the position of the maximum is in any case very uncertain, as the intensity does not change smoothly in going from class to class.
COMPOUNDS OF TITANIUM