Abhyankar, K. D; Ramanathan, A. S
(American Astronomical Society, 1955-05)
Equivalent widths of 82 Cr I lines, 70 Fe 1 lines, and 74 Ti I lines are measured in the spectra of four sunspots of average area 55 millionths of the visible hemisphere of the sun. Separate curves of growth for Cr I, Fe ...