B.A. M.A. (Sask.), Ph.D. (Michigan), Hon. D. Sc. (U. of
12C/13C abundance ratios in carbon stars; F-K type supergiant
stars; commentary spectra.
A major area of research
has been the determination of 12C/13C abundance ratios in carbon
stars. This ratio is important for the understanding of nuclear
processes and the production of energy in stellar interiors.
Another area of research
has been spectroscopic studies of F-K type supergiant stars.
The spectra of these stars reveal the presence of expanding
envelopes surrounding the stars with velocities indicating that
mass loss is occurring in some of them. In some cases, radial
velocity variations support a binary nature. Also, variations
with time in relative intensities of several emission lines
occur which are not fully understood.