Deuterium and hydrogen in the local interstellar medium

Details Deuterium and hydrogen in the local interstellar medium Deuterium and hydrogen in the local interstellar medium

Dec 1977

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...218..361d&link_type=abstract

Astrophysical Journal, Part 1, vol. 218, Dec. 1, 1977, p. 361-369. Research supported by the University of Delaware Research Fo

Astronomy and Astrophysics

Astronomy

56

Abundance, Deuterium, Gas Density, Hydrogen, Interstellar Gas, Lyman Alpha Radiation, Binary Stars, H Lines, Interstellar Matter, Oao 3, Ultraviolet Astronomy, Ultraviolet Spectroscopy

Scientific paper

Densities of neutral hydrogen and deuterium are found from observation with the Copernicus satellite of the Ly-alpha line toward two nearby stars. The hydrogen density is 0.03 + or - 0.01 per cu cm toward Alpha Aur (Capella) and 0.20 + or - 0.05 per cu cm in the direction of Alpha Cen A, values indicating that the nearby (less than 14 pc) interstellar medium is inhomogeneous and can be of low density in certain directions. The ratios of deuterium to hydrogen - 3.9 (+5.7, -1.7) by 10 to the -5th power and 0.24 (+0.12, -0.07) by 10 to the -5th power for Alpha Aur and Alpha Cen A, respectively - suggest that variations in the deuterium abundance may exist.

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