Browsing by Author "Karakas, Amanda I."

Now showing items 1-8 of 8

    • Chemical Evolution with Radial Mixing Redux: a detailed model for formation and evolution of the Milky Way 

      Chen, Boquan; Hayden, Michael R.; Sharma, Sanjib; Bland-Hawthorn, Joss; Kobayashi, Chiaki; Karakas, Amanda I. (2023-08-31)
      We present a multi-zone galactic chemical evolution (GCE) model for the Milky Way that takes the most recently updated yields of major nucleosynthesis channels into account. It incorporates physical processes commonly found ...

    • Evolution of fluorine in the galaxy with the v-process 

      Kobayashi, Chiaki; Izutani, Natsuko; Karakas, Amanda I.; Yoshida, Takashi; Yong, David; Umeda, Hideyuki (2011-10-01)
      We calculate the evolution of fluorine in the solar neighborhood with the v-process of core-collapse supernovae, the results of which are in good agreement with the observations of field stars. The v-process operating in ...

    • The evolution of isotope ratios in the Milky Way Galaxy 

      Kobayashi, Chiaki; Karakas, Amanda I.; Umeda, Hideyuki (2011-07)
      Isotope ratios have opened a new window into the study of the details of stellar evolution, supernovae and galactic chemical evolution. We present the evolution of the isotope ratios of elemental abundances (from C to Zn) ...

    • 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 impact of metallicity on nova populations 

      Kemp, Alex J.; Karakas, Amanda I.; Casey, Andrew R.; Kobayashi, Chiaki; Izzard, Robert G. (2022-01-01)
      The metallicity of a star affects its evolution in a variety of ways, changing stellar radii, luminosities, lifetimes, and remnant properties. In this work, we use the population synthesis code binary_c to study how ...

    • Internal entrainment and the origin of jet-related broad-band emission in Centaurus A 

      Wykes, Sarka; Hardcastle, M.J.; Karakas, Amanda I.; Vink, Jorick S. (2015-02-11)
      The dimensions of Fanaroff-Riley class I jets and the stellar densities at galactic centres imply that there will be numerous interactions between the jet and stellar winds. These may give rise to the observed diffuse and ...

    • The Origin of Elements from Carbon to Uranium 

      Kobayashi, Chiaki; Karakas, Amanda I.; Lugaro, Maria (2020-09-15)
      To reach a deeper understanding of the origin of elements in the periodic table, we construct Galactic chemical evolution (GCE) models for all stable elements from C (A = 12) to U (A = 238) from first principles, i.e., ...

    • 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 ...