+ Visit NASA.gov + Contact NASA   + Home Collection > NASA  Author > Ayres, Thomas R.  Author > Brown, Alexander  Author > Diplas, Athanassios  Author > Gayley, Ken  Author > Heap, Sara R.  Author > Landsman, Wayne  Author > Linsky, Jeffrey L.  Author > Savage, Blair D.  Author > Shore, Steven N.  NASA Center > Goddard Space Flight Center  Publication Year > 1991-2000 > 1993  Subject > A-C > Astrophysics  Availability Options > Order From Other Sources  Item/Media Type > Journal Article  Note: Start a new navigation search by selecting a link above     Previous Record | Next Record + Back to Results   + Printer Friendly Title: Goddard high-resolution spectrograph observations of the local interstellar medium and the deuterium/hydrogen ratio along the line of sight toward Capella Author(s): Linsky, Jeffrey L.; Brown, Alexander; Gayley, Ken; Diplas, Athanassios; Savage, Blair D.; Ayres, Thomas R.; Landsman, Wayne; Shore, Steven N.; Heap, Sara R. Abstract: 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. NASA Center: Goddard Space Flight Center Publication Date: Jan. 10, 1993 Document Source: Other Sources No Digital Version Available: Go to Tips On Ordering Document ID: 19930037610 Accession ID: 93A21607 Publication Information: Astrophysical Journal, Part 1, 402, 2, p. 694-709., ISSN 0004-637X, Number of Pages = 16 Contract-Grant-Task Number: NAG5-1215 Keywords: ASTRONOMICAL SPECTROSCOPY; BINARY STARS; DEUTERIUM; HYDROGEN; ABUNDANCE; BARYONS; GALACTIC EVOLUTION; LINE SPECTRA; LYMAN ALPHA RADIATION; UNIVERSE; Notes: Astrophysical Journal, Part 1 vol. 402, no. 2 p. 694-709. Jan. 10, 1993 Accessibility: Unclassified; Copyright; Unlimited; Publicly available; Updated/Added to NTRS: 2004-11-03 + Back to Top + Sponsored by the NASA Scientific and Technical    Information Program + 2004 Vision for Space Exploration + Freedom of Information Act + NASA Web Privacy Policy and Important Notices + NASA Disclaimers, Copyright Notice,    and Terms and Conditions of Use NASA Official: Calvin Mackey Page Curator: NASA Center for AeroSpace Information (help@sti.nasa.gov) Last Updated: July 5, 2007