Copper and barium abundances in the Ursa Major Moving Group

被引：33
作者：
Castro, S
de Mello, GFP
da Silva, L
机构：
[1] Univ Fed Rio de Janeiro, Observ Valongo, BR-20080090 Rio De Janeiro, Brazil
[2] Observ Nacl, Dept Astron, BR-20921400 Rio De Janeiro, Brazil
来源：
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY | 1999年 / 305卷 / 03期
关键词：
stars; abundances; Galaxy; open clusters and associations; individual; Ursa Major;
D O I：
10.1046/j.1365-8711.1999.02455.x
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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.
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页码：693 / 700
页数：8
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