Mathematics – Logic
Scientific paper
Jul 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991hst..prop.2536v&link_type=abstract
HST Proposal ID #2536
Mathematics
Logic
Hst Proposal Id #2536
Scientific paper
Evaluation of the primordial deuterium abundance is one of the few crucial observational constraint one may be able to place on cosmological models. Several approaches were attempted, but none up to now has produced a clear-cut answer. Even the best available estimations, completed in the interstellar medium through the Lyman lines of HI and DI, lead to evidences of variations up to a factor of four. In the local interstellar medium, fluctuations seem to exist over scales of few parsecs. It is of prime importance to check the existence of these local variations and eventually understand their causes. HST with HRS is best adapted to perform this analysis started with Copernicus and the IUE. In particular, its high sensitivity allows to use also white dwarfs as target stars at the Lambda/Delta Lambda = 10^5 resolution. These observations will dramatically improve the previous error bars because: 1)the stellar continuum is well known, 2)the detailed line of sight structure is observable; 3)the HI content in each individual component is accessible. Furthermore, from an extensive high resolution ground-based survey we have completed toward nearby stars, we pointed out the presence of several local velocity components. In consequence, we have eliminated regions in the sky where only averaged cloud properties are accessible-we are looking for local fluctuations-and selected regions where confusion is minimized. The expected refined evaluation of the deuterium
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