The abundance of deuterium relative to hydrogen in interstellar space.
Abstract
Copernicus satellite observations of the deuterium and hydrogen Lyman lines in the lines of sight to mu COl, gamma-2 Vel, alpha Cru AB, and alpha Vir AB are reported. Together with previously published data for beta Cen A, the results yield a value N(D)/N(H) of approximately 0.000018 (m.e.) or a total deuterium mass portion of approximately 0.000025. Values for all stars with their error bars are contained within a band ranging from 0.25 to 2.0 times the quoted mean ratio. These limits are probably representative of the region within 200 pc of the sun. The results for these stars are essentially independent of assumptions about the Doppler parameter describing the formation of the lines, although this value can be derived from the observations. The results are consistent with a maximum temperature of 6000 K for the lines of sight studied.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- January 1976
- DOI:
- 10.1086/154089
- Bibcode:
- 1976ApJ...203..378Y
- Keywords:
-
- Abundance;
- Deuterium;
- Hydrogen Atoms;
- Interstellar Gas;
- Lyman Spectra;
- Gas Density;
- Graphs (Charts);
- H Lines;
- Lyman Alpha Radiation;
- Lyman Beta Radiation;
- Spaceborne Astronomy;
- Spectrum Analysis;
- Tables (Data);
- Astrophysics