Implications of bimodal star formation on the chemical evolution of the Galaxy - The evolution of deuterium

Details Implications of bimodal star formation on the chemical evolution of the Galaxy - The evolution of deuterium Implications of bimodal star formation on the chemical evolution of the Galaxy - The evolution of deuterium

Mar 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...193...81v&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 193, no. 1-2, March 1988, p. 81-86. Research supported by the University of Ca

Astronomy and Astrophysics

Astrophysics

37

Chemical Evolution, Cosmochemistry, Deuterium, Milky Way Galaxy, Star Formation, Light Elements, Metallicity, Nuclear Fusion, Solar Neighborhood

Scientific paper

In order to reconcile the predictions of the classical models of early nucleosynthesis regarding D and 4He primordial abundances, D has to be destroyed by factors ˜10 over the galactic history. This study develops different models of galactic evolution: In Model III, the rate of star formation (SFR) is bimodal; in Model II, the SFR is governed by two different regimes, one applying to very early phases, and the second to the rest of the galactic evolution. Model I is standard. Current models with bimodal SER (Models III and IV) are not able to account for a large D destruction, especially because of metallicity overproduction. By contrast, time varying SFR models (Model II) could explain a large D destruction (by factors 5-10) avoiding an overabundance of metals at the present time. However this model might have to face constraints related to the stellar luminosity function.

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