Studies of H i and D i in the Local Interstellar Medium
Moos, H. W.; Murthy, J.; Linsky, J. L.; Vidal-Madjar, A.; Gry, C.; Henry, R. C.
United States, France
Abstract
High-dispersion IUE spectra are presented of the hydrogen Ly-alpha chromospheric emission line of two nearby late-type stars, Capella and Lambda And. Both interstellar H I and D I Ly-alpha absorption can be seen against the chromospheric line, and the density, velocity dispersion, and bulk velocity of the gas in those lines of sight are derived. Limits are placed on the D/H ratio. The results are consistent with the current picture of the local interstellar medium.