Browsing by Author "Karakas, A. I."

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    • Current hot questions on the s process in AGB stars 

      Lugaro, M.; Campbell, S. W.; D'Orazi, V.; Karakas, A. I.; Garcia-Hernandez, D. A.; Stancliffe, R. J.; Tagliente, G.; Iliadis, C.; Rauscher, T. (2016-01-05)
      Asymptotic giant branch (AGB) stars are a main site of production of nuclei heavier than iron via the s process. In massive (>4 M⊙) AGB stars the operation of the 22Ne neutron source appears to be confirmed by observations ...

    • The GALAH Survey : Non-LTE departure coefficients for large spectroscopic surveys 

      Amarsi, A. M.; Lind, K.; Osorio, Y.; Nordlander, T.; Bergemann, M.; Reggiani, H.; Wang, E. X.; Buder, S.; Asplund, M.; Barklem, P. S.; Wehrhahn, A.; Skúladóttir, Á.; Kobayashi, C.; Karakas, A. I.; Gao, X. D.; Bland-Hawthorn, J.; Silva, G. M. De; Kos, J.; Lewis, G. F.; Martell, S. L.; Sharma, S.; Simpson, J. D.; Zucker, D. B.; Čotar, K.; Horner, J.; collaboration, the GALAH (2020-10-06)
      Massive sets of stellar spectroscopic observations are rapidly becoming available and these can be used to determine the chemical composition and evolution of the Galaxy with unprecedented precision. One of the major ...

    • Sc and neutron-capture abundances in Galactic low- and high-alpha field halo stars 

      Fishlock, C. K.; Yong, D.; Karakas, A. I.; Alves-Brito, A.; Melendez, J.; Nissen, P. E.; Kobayashi, C.; Casey, A. R. (2017-05-01)
      We determine relative abundance ratios for the neutron-capture elements Zr, La, Ce, Nd and Eu for a sample of 27 Galactic dwarf stars with −1.5 < [Fe/H] < −0.8. We also measure the iron-peak element Sc. These stars separate ...