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Goddard high-resolution spectrograph observations of the local interstellar medium and the deuterium/hydrogen ratio along the line of sight toward Capella
Linsky, Jeffrey L.; Brown, Alexander; Gayley, Ken; Diplas, Athanassios; Savage, Blair D.; Ayres, Thomas R.; Landsman, Wayne; Shore, Steven N.; Heap, Sara R.
AA(NIST; Joint Inst. for Lab. Astrophysics, Boulder, CO), AB(Joint Inst. for Lab. Astrophysics, Boulder, CO), AC(Joint Inst. for Lab. Astrophysics, Boulder, CO), AD(Wisconsin Univ., Madison), AE(Wisconsin Univ., Madison), AF(Colorado Univ., Boulder), AG(Hughes STX Corp; NASA, Goddard Space Flight Center, Greenbelt, MD), AH(Hughes STX Corp; NASA, Goddard Space Flight Center, Greenbelt, MD), AI(NASA, Goddard Space Flight Center, Greenbelt, MD)
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 402, no. 2, p. 694-709. (ApJ Homepage)
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NASA/STI Keywords:
Astronomical Spectroscopy, Binary Stars, Deuterium, Hydrogen, Abundance, Baryons, Galactic Evolution, Line Spectra, Lyman Alpha Radiation, Universe
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HST Goddard High-Resolution Spectrograph observations of the 1216, 2600, and 2800 A spectral regions are analyzed for the spectroscopic binary system Capella, obtained at orbital phase 0.26 with 3.27-3.57 km/s resolution and high SNR. The column densities of H I, D I, Mg II, and Fe II for the local interstellar medium along this 12.5 pc line of sight, together with estimates of the temperature and turbulent velocity are inferred. It is inferred that the atomic deuterium/hydrogen ratio by number is 1.65(+0.07, -0.18) x 10 exp -5 for this line of sight. Galactic evolution calculations indicate that the primordial D/H ratio probably lies in the range of (1.5-3) x (D/H)LISM. If H0 = 80 km/s Mpc, as recent evidence suggests, then the baryonic density in units of the Einstein-de Sitter closure density is 0.023-0.031. Thus the universe is argued to expand forever, unless nonbaryonic matter greatly exceeds the amount of baryonic matter.

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