In which part of the Milky Way would you find no current star formation and stars that are older than 10 million years?
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64 Citations | Thus, the only way to constrain our theoretical understanding of the formation of the first stars is to searchfor their imprints left in the oldest, still surviving, stars in our own backyard: the Milky Way and its satellites. |
| We infer, for the RR Lyrae stars in the bulge spheroid, an extremely ancient age of $13.41 \pm 0.54$ Gyr and conclude they were among the first stars to form in what is now the Milky Way galaxy. | |
| If the ancient Galactic globular clusters such as M92 formed concurrently with the early formation of the Milky Way galaxy itself, then the Ursa Minor dwarf spheroidal is probably as old as the Milky Way. | |
| We tentatively study the star formation history in L1641 based on the age distribution and find that star formation started to be active 2-3 Myr ago. | |
2 Citations | Our results do not unambiguously answer the question of whether Leo I began forming stars around 15 Gyr ago, but it appears that the amount of this star formation, if it existed at all, would be small. |
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