MG II emission lines in the spectra of cool, high luminosity stars
We present the initial results of a survey of the Mg II emission lines in the spectra of K and M giants, bright giants, and supergiants. Profiles of the Mg II h and k lines in 12 such stars are shown in a relative spectral type/luminosity class grid. Plots based on the h-line data illustrate the existence of a Wilson-Bappu. effect in these lines and of a slight dependence of the line asymmetry on V-R color. A time series of Mg II profiles for the M3 giant Gamma Cru show that the Mg II profiles have not undergone the profile shape changes seen in the Fe II lines from this star over the same time period.
KeywordsEmission Line Slight Dependence Stellar Temperature Colorado Boulder Class Grid
Unable to display preview. Download preview PDF.