• 18 Sco : a solar twin rich in refractory and neutron-capture elements, implications for chemical tagging 

      Meléndez, Jorge; Ramírez, Iván; Karakas, Amanda I.; Yong, David; Monroe, TalaWanda Rose; Bedell, Megan; Bergemann, Maria; Asplund, Martin; Maia, Marcelo Tucci; Bean, Jacob L.; Nascimento Júnior, José Dias do; Bazot, Michael; Alves-Brito, Alan; Freitas, Fabrício Catani de; Castro, Matthieu Sébastien (2014) [Artigo de periódico]
      We study with unprecedented detail the chemical composition and stellar parameters of the solar twin 18 Sco in a strictly differential sense relative to the Sun. Our study is mainly based on high-resolution (R ∼ 110,000), ...
    • Chemical abundances in bright giants of the globular cluster M62 (NGC 6266) 

      Yong, David; Alves-Brito, Alan; Da Costa, Gary Stewart; Alonso Garcia, Javier; Karakas, Amanda I.; Pignatari, Marco; Roederer, Ian U.; Aoki, Wako; Fishlock, Cherie K.; Grundahl, Frank; Norris, John E. (2014) [Artigo de periódico]
      With the exception of Terzan 5, all the Galactic globular clusters that possess significant metallicity spreads, such as ω Cen and M22, are preferentially the more luminous clusters with extended horizontal branches. Here ...
    • GRACES observations of young [α/Fe]-rich stars 

      Yong, David; Casagrande, Luca; Venn, Kimberly A.; Chené, André-Nicolas; Keown, Jared; Malo, Lison; Martioli, Eder; Alves-Brito, Alan; Asplund, Martin; Dotter, Aaron Loveren; Martell, Sarah L.; Meléndez, Jorge; Schlesinger, K.J. (2016) [Artigo de periódico]
      We measure chemical abundance ratios and radial velocities in four massive (i.e. young) [α/Fe]-rich red giant stars using high-resolution high-S/N spectra from ESPaDOnS fed by Gemini-GRACES. Our differential analysis ensures ...
    • Sc and neutron-capture abundances in Galactic low- and high-α field halo stars 

      Fishlock, Cherie K.; Yong, David; Karakas, Amanda I.; Alves-Brito, Alan; Meléndez, Jorge; Nissen, Poul Erik; Kobayashi, Chiaki; Casey, Andrew Raithby (2017) [Artigo de periódico]
      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 ...
    • The chemical homogeneity of sun-like stars in the solar neighborhood 

      Bedell, Megan; Bean, Jacob L.; Meléndez, Jorge; Spina, Lorenzo; Ramírez, Iván; Asplund, Martin; Alves-Brito, Alan; Santos, Leonardo Augusto Gonçalves dos; Dreizler, Stefan; Yong, David; Monroe, TalaWanda Rose; Casagrande, Luca (2018) [Artigo de periódico]
      The compositions of stars are a critical diagnostic tool for many topics in astronomy such as the evolution of our Galaxy, the formation of planets, and the uniqueness of the Sun. Previous spectroscopic measurements indicate ...
    • The EMBLA survey : metal-poor stars in the Galactic bulge 

      Howes, Louise M.; Asplund, Martin; Keller, Stefan C.; Casey, Andrew Raithby; Yong, David; Lind, Karin; Frebel, Anna; Hays, Austin; Alves-Brito, Alan; Bessell, Michael S.; Casagrande, Luca; Marino, Anna F.; Nataf, David M.; Owen, Christopher I.; Da Costa, Gary Stewart; Schmidt, Brian P.; Tisserand, Patrick (2016) [Artigo de periódico]
      Cosmological models predict the oldest stars in theGalaxy should be found closest to the centre of the potential well, in the bulge. The Extremely Metal-poor BuLge stars with AAOmega survey (EMBLA) successfully searched ...
    • The Li–age correlation: the Sun is unusually Li deficient for its age 

      Carlos, Marília Gabriela Cardoso Corrêa; Meléndez, Jorge; Spina, Lorenzo; Santos, Leonardo Augusto Gonçalves dos; Bedell, Megan; Ramírez, Iván; Asplund, Martin; Bean, Jacob L.; Yong, David; Galarza, Jhon Joel Yana; Alves-Brito, Alan (2019) [Artigo de periódico]
      This work aims to examine in detail the depletion of lithium in solar twins to better constrain stellar evolution models and investigate its possible connection with exoplanets. We employ spectral synthesis in the region ...
    • The temporal evolution of neutron-capture elements in the Galactic discs 

      Spina, Lorenzo; Meléndez, Jorge; Karakas, Amanda I.; Santos, Leonardo Augusto Gonçalves dos; Bedell, Megan; Asplund, Martin; Ramírez, Iván; Yong, David; Alves-Brito, Alan; Bean, Jacob L.; Dreizler, Stefan (2018) [Artigo de periódico]
      Important insights into the formation and evolution of the Galactic disc(s) are contained in the chemical compositions of stars.We analysed high-resolution and high signal-to-noise HARPS spectra of 79 solar twin stars in ...
    • Thorium in solar twins : implications for habitability in rocky planets 

      Botelho, Rafael Bueno; Milone, André de Castro; Meléndez, Jorge; Bedell, Megan; Spina, Lorenzo; Asplund, Martin; Santos, Leonardo Augusto Gonçalves dos; Bean, Jacob L.; Ramírez, Iván; Yong, David; Dreizler, Stefan; Alves-Brito, Alan; Galarza, Jhon Joel Yana (2019) [Artigo de periódico]
      We have investigated the thorium (Th) abundance in a sample of 53 thin disc solar twins covering a wide range of ages. These data provide constrains on the mantle energy budget of terrestrial planets that can be formed ...