Browsing by Author "Cohen, Judith G."

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    • A formation timescale of the Galactic halo from Mg isotopes in dwarf stars 

      Carlos, Marilia; Karakas, Amanda I.; Cohen, Judith G.; Kobayashi, Chiaki; Melendez, Jorge (2018-04-04)
      We determine magnesium isotopic abundances of metal-poor dwarf stars from the galactic halo, to shed light on the onset of asymptotic giant branch (AGB) star nucleosynthesis in the galactic halo and constrain the timescale ...

    • The remarkable solar twin HIP 56948: : a prime target in the quest for other Earths 

      Melendez, Jorge; Bergemann, Maria; Cohen, Judith G.; Endl, Michael; Karakas, Amanda I.; Ramirez, Ivan; Cochran, William D.; Yong, David; MacQueen, Phillip J.; Kobayashi, Chiaki; Asplund, Martin (2012-07-01)
      We study HIP 56948, the best solar twin known to date, to determine with an unparalleled precision how similar is to the Sun in its physical properties, chemical composition and planet architecture. We explore whether the ...