IUE observations of hydrogen and deuterium in the local interstellar medium

Details IUE observations of hydrogen and deuterium in the local interstellar medium IUE observations of hydrogen and deuterium in the local interstellar medium

Apr 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...315..675m&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 315, April 15, 1987, p. 675-686.

Astronomy and Astrophysics

Astrophysics

56

Astronomical Spectroscopy, Deuterium, Hydrogen, Interstellar Matter, Stellar Spectra, Ultraviolet Spectra, Absorption Spectra, Abundance, Hot Stars, Iue, Solar System

Scientific paper

The authors present and analyze high-dispersion IUE observations of the interstellar hydrogen and deuterium Lyα absorption profiles toward the late-type stars ɛ Eri (3.3 pc), Procyon (3.5 pc), Altair (5.1 pc), Capella (13.2 pc), and HR 1099 (33 pc). They derive values for the density nH I, the velocity dispersion bH I, the bulk velocity vH I and determine lower limits on the deuterium-to-hydrogen ratio (nD I/nH I). The results are compared with previous Copernicus data. Interstellar deuterium is detected toward every star except Altair. In particular, the strong lower limit of D/H ≥ 1.9×10-5 from Copernicus is confirmed for the Capella sightline. A value of D/H = 2.0×10-5 is consistent with all observations of late-type stars.

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