Some Intrinsic Properties of Carbon Stars
Near-infrared spectrograms of moderate dispersion have been employed to establish a new twodimensional classification scheme for carbon stars which involves temperature and luminosity. Intrinsic colors of the spectral subtypes were determined, and these were employed to construct a color-color diagram which clearly separated out the early- and late-type stars. A galactic-rotation solution, using radial velocities and intrinsic colors, yielded a mean absolute magnitude of - 2.7 for the middle carbon stars. This value was employed to construct the (Mb5i, log T )-diagram for these stars which were found to form an extension of the normal giant branch to cooler temperature.
The Astrophysical Journal
- Pub Date:
- August 1971