The r-Process in the Galaxy: Europium Abundances in 1070 Field Stars and 9 Open Clusters

Details The r-Process in the Galaxy: Europium Abundances in 1070 Field Stars and 9 Open Clusters The r-Process in the Galaxy: Europium Abundances in 1070 Field Stars and 9 Open Clusters

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21531002p&link_type=abstract

American Astronomical Society, AAS Meeting #215, #310.02; Bulletin of the American Astronomical Society, Vol. 42, p.307

Astronomy and Astrophysics

Astronomy

Scientific paper

We present europium abundance measurements of 1070 field stars and 9 open clusters of the Milky Way. Both data sets reveal r-process element abundance to be constant over the past 10 Gyr. The field stars also reveal that stars with extrasolar planets contain more europium, given their metallicity, than stars without extrasolar planets. We also find a strong anti-correlation between [Eu/Fe] and [Fe/H], with a slope at solar metallicity of -0.46, consistent with existing Galactic enrichment models that predict the bulk of Galactic r-process enrichment to be due to an early epoch of star formation. We also find that the 0.11 dex scatter in [Eu/H] at a given metallicity is attributable to real variations among nearby stars.

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