Chromospheres of K-Type Stars and Local Interstellar Matter.
Abstract
High spectral resolution ultraviolet and visible observations of chromospheric emission lines in K-type stars were made. Measurements of L alpha, the Mg (II) lambda 2800 resonance doublet, and upper limits on emission line intensities from ionized metals were made. Ground based measurements of the Ca (II) K line in alpha Tau were obtained. Observations of L alpha emission in the nearby main sequence K star epsilon Eri set limits on the velocity, the velocity dispersions, and the densities of atomic hydrogen and deuterium in the local interstellar medium. Surface fluxes and profiles of L alpha in five stars and Mg (II) in seven stars were compared. The surface fluxes of both were an order of magnitude greater than those in giants and supergiants. These results are consistent with an analysis of the Ca (II) K line intensities in late type stars.
- Publication:
-
Ph.D. Thesis
- Pub Date:
- 1977
- Bibcode:
- 1977PhDT.........6M
- Keywords:
-
- Physics: Astronomy and Astrophysics;
- Chromosphere;
- Interstellar Matter;
- K Lines;
- K Stars;
- Stellar Spectra;
- Main Sequence Stars;
- Spectrographs;
- Stellar Atmospheres;
- Astronomy