| Summary: | A catalogue of cool carbon stars in the Large Magellanic Cloud is presented along with photometric and spectroscopic observations of some of the members. Image tube spectra at a dispersion of 117 A/mm were obtained for seven of the stars in order to investigate some of the grosser features of the spectrum. In addition photometric observations on the VRI system of forty stars have been made.
The spectra indicate that three of the carbon stars observed show enhancement of spectral features involving the ¹³C isotope. Using the photometric observations to place the stars in a theoretical Hertzsprung-Hussell diagram, it is concluded that (1) all forty stars are in the double-shell source phase of evolution and, (2) the helium shell flashes are responsible for the formation of the majority of cool N-type carbon stars. === Science, Faculty of === Earth, Ocean and Atmospheric Sciences, Department of === Graduate
|
|---|
