The ratio of deuterium to hydrogen in interstellar space. V The line of sight to Epsilon Persei

Astronomy and Astrophysics – Astrophysics

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Absorption Spectra, Abundance, Deuterium, Hydrogen Clouds, Interstellar Gas, Stellar Winds, Early Stars, H Lines, Lyman Spectra, Stellar Evolution, Stellar Luminosity

Scientific paper

The study of deuterium in the direction of ɛ Per has revealed a time variation of the observed D I absorption feature. To explain this variation the authors suppose that H I material is present in the stellar wind producing the narrow absorption features observed on the blue wing of the Lyman lines. In consequence it appears that deuterium absorption lines may sometimes be contaminated by high-velocity H I present in stellar winds. Reviewing the previously published deuterium abundance determinations, it is shown that a correlation seems to exist between the stellar luminosity class and the D/H values, the lowest D/H value corresponding to the more evolved stars. The conclusion is that the local interstellar deuterium abundance is more probably of the order of 5×10-6 rather than 2×10-5 as previously thought.

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