The velocity field of the extended populations for the cluster cores appears asymmetric but is aligned along a spatial axis unique to each cluster. The overall spatial distribution and the kinematic signature of the populations are largely consistent with the differential rotation pattern of the Milky Way. This finding underlines the important role of global Galactic dynamics in the fate of stellar systems.
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So many have been found, in fact, that astronomers have begun dividing them into categories: M, L, T, and, most recently Y. Kirkpatrick has specialized in searching for Y-class dwarfs. The unique aspect of their spectrum is evidence of the existence of methane, which cannot exist at the higher temperatures found in the other types of dwarf stars.
Kirkpatrick, who grew up on a dairy and tobacco farm in Hendersonville, Tenn. Vanderbilt University. They observed the stars over many years with the 0.
The team identified 22 new cool subdwarfs within light-years, of which three are within 82 light-years, and an additional five subdwarfs from to light-years. Among the new subdwarfs, they discovered two old binary stars, even though older stars are typically found to be alone, rather than in pairs. Jao said.
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