Observations of interstellar hydrogen and deuterium toward Alpha Centauri A

Details Observations of interstellar hydrogen and deuterium toward Alpha Centauri A Observations of interstellar hydrogen and deuterium toward Alpha Centauri A

Oct 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...285..801l&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 285, Oct. 15, 1984, p. 801-807.

Astronomy and Astrophysics

Astrophysics

34

Interstellar Gas, Late Stars, Stellar Spectra, Ultraviolet Spectra, Abundance, Deuterium, Hydrogen, Iue, Lyman Alpha Radiation

Scientific paper

The authors present a composite profile of the Lyα emission line of α Cen A, obtained from 10 individual spectra with the high-resolution spectrograph aboard the satellite. There is excellent overall agreement with two previous Copernicus observations. Interstellar deuterium is detected, and a lower limit is set on the deuterium to hydrogen ratio of nDI/nHI > 8×10-6. In addition, the deuterium bulk velocity appears blueshifted by 8 ± 2 km s-1 with respect to interstellar hydrogen, suggesting a nonuniform medium along the line of sight.

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