LAMOST 1: A Disrupted Satellite in the Constellation Draco
arXiv:1512.05090 · doi:10.3847/2041-8205/816/1/L2
Abstract
Using LAMOST spectroscopic data, we find a strong signal of a comoving group of stars in the constellation of Draco. The group, observed near the apocenter of its orbit, is 2.6 kpc from the Sun with a metallicity of -0.64 dex. The system is observed as a streaming population of unknown provenance with mass of about 2.1E4 solar masses and an absolute V band magnitude of about -3.6. Its high metallicity, diffuse physical structure, and eccentric orbit may indicate that the progenitor satellite was a globular cluster rather than a dwarf galaxy or an open cluster.
6 pages, 4 Figures, 1 Table, Accepted to ApJL
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