Moreover, the age distribution of the new dwarf stars fits the age distribution expected of white dwarfs in the galaxy's disk rather than a halo population
, according to Brad M.
Massive, bright blue stars belonging to the halo population
died long ago, so the brightest remaining stars are red giants.
Maria Bergemann (Max Planck Institute for Astronomy, Germany) and colleagues studied 14 stars in two halo populations
, known as A13 and Triangulum-Andromeda (TriAnd), using the Keck I telescope in Hawai'i and the Very Large Telescope in Chile.