Bappu, M. K. V; Mekkaden, M. V; Kameswara Rao, N
(Astronomical Society of India, 1984-06)
The Changes in the Ca II K line profile of the F0 supergiant Canopus have been studied from the high dispersion coude spectrograms obtained since 1975. The emission in the core of the line is variable in a timescale of few ...