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The Thorium abundance for the red giant COS82 in the Ursa Minor dwarfspheroidal galaxy is determined based on a high resolution spectrum. This isthe first detection of actinides in an extra Galactic object. A detailedabundance pattern is determined for 12 other neutron-capture elements from theatomic number 39 to 68. These elements are significantly over-abundant withrespect to other metals like Fe (> 1 dex) and their abundance pattern agreeswell with those of the r-process-enhanced, very metal-poor stars known in theGalactic halo, while the metallicity of this object ([Fe/H] ~ -1.5) is muchhigher than these field stars ([Fe/H] ~ -3.0). The results indicate that themechanism and the astrophysical site that are responsible for neutron-captureelements in COS82 is similar to that for field r-process-enhanced stars, whilethe condition of low mass star formation is quite different. An estimate of theage of this object based on the Th abundance ratio is discussed.

The first determination of the actinide Th abundance for a red giant of the Ursa Minor dwarf galaxy