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We undertake the first high resolution spectroscopic study of theTriangulum-Andromeda (TriAnd) star cloud --- an extended, mid-latitude MilkyWay halo substructure about 20 kpc away in the second Galactic quadrant ---through six M giant star candidates selected to be both spatially anddynamically associated with this system. The abundance patterns of [Ti/Fe],[Y/Fe] and [La/Fe] as a function of [Fe/H] for these stars support TriAnd ashaving an origin in a dwarf galaxy with a chemical enrichment history somewhatsimilar to that of the Sagittarius dwarf spheroidal (dSph) galaxy. We alsoinvestigate the previously proposed hypothesis that TriAnd is an outlying,dynamically older piece of the Monoceros Stream (also known as the GalacticAnticenter Stellar Structure, "GASS") under the assumption that both featurescome from the tidal disruption of the same accreted Milky Way satellite andfind that net differences in the above abundance patterns between the TriAndand GASS stars studied suggest that these two systems are independent andunrelated.

First Chemical Analysis of Stars in The Triangulum-Andromeda Star Cloud