Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aas...197.3606k&link_type=abstract
American Astronomical Society, 197th AAS Meeting, #36.06; Bulletin of the American Astronomical Society, Vol. 32, p.1450
Astronomy and Astrophysics
Astronomy
Scientific paper
High resolution spectra of the DA white dwarf HZ 43 covering the wavelength range 905--1187Å were obtained with the Far Ultraviolet Spectroscopic Explorer (FUSE) for the purpose of studying the deuterium abundance of the local interstellar medium. These spectra exhibit clean interstellar lines of O i and N i, permitting a determination of the column densities for these species. Only an upper limit to the D i absorption could be determined, because of contamination by the H i geocoronal airglow admitted by the large aperture used for this observation. Archival HST/GHRS spectra in the vicinity of Lyman α were used instead to determine the D i and H i column densities, the latter determined from a fit to the damping wings of the Lyman α transition. Further FUSE observations of HZ 43 using the smaller MDRS aperture will be obtained in order to better constrain the D i column density using the Lyman-series lines in the FUSE bandpass. We will present determinations of the column densities and uncertainties of interstellar D i, H i, O i, and N i along this sight line and discuss the potential sources of systematic error in these measurements. This work is based on data obtained for the Guaranteed Time Team by the NASA-CNES-CSA FUSE mission operated by the Johns Hopkins University. Financial support to U. S. participants has been provided by NASA contract NAS5-32985.
André Martial
Chayer Pierre
Ferlet Roger
FUSE Science Team
Hebrard Guillaume
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