We present Cu and Ba abundances for seven GK dwarf stars, members of the solar-metallicity, 0.3-Gyr-old Ursa Major Moving Group. All analysed member stars show [Ba/Fe] excesses of +0.3-plus, associated with [Cu/Fe] deficiencies of up to -0.23 dex. The present results suggest that there is an anticorrelation between the abundances of Cu and the heavy elements produced by the main component of the neutron-capture s-process. Other possible anomalies are Na and C deficiencies with respect to normal solar-metallicity stars. The new data do not confirm the recent claim that the group member HR 6094 is a Ba dwarf star.
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- May 1999
- STARS: ABUNDANCES;
- GALAXY: ABUNDANCES;
- OPEN CLUSTERS AND ASSOCIATIONS: INDIVIDUAL: URSA MAJOR;
- 8 pages, 6 figures, accepted to MNRAS