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SUMMARY:On the cosmic origin of copper\, silver\, and gold: from atomic st
 ructure to stellar abundances
DTSTART:20260408T113000Z
DTEND:20260408T123000Z
DTSTAMP:20260428T225000Z
UID:indico-event-9510@indico.fysik.su.se
DESCRIPTION:Speakers: Sema Caliskan (Theoretical Astrophysics\, Uppsala Un
 iversity\, Sweden)\n\nThe cosmic origin of elements heavier than iron rema
 ins one of the open questions in astrophysics. These elements are produced
  through neutron-capture processes in diverse astrophysical sites\, but to
  disentangle their contributions and galactic evolution\, we rely on accur
 ate stellar abundances. Deriving these abundances requires reliable 3D/non
 -LTE models of stellar spectra. However\, for many heavy elements\, non-LT
 E modelling is still missing due to the scarcity of accurate atomic data.\
 nDuring my PhD\, I have worked at this intersection\, aiming to improve at
 omic data and construct more accurate non-LTE models for heavy elements. I
  will present results from different stages of this work\, with case studi
 es from copper\, silver\, and gold\, spanning atomic structure calculation
 s\, the determination of key atomic data\, and non-LTE modelling. I will s
 how how improved atomic data\, such as hydrogen collision rates\, impact n
 on-LTE abundance determinations of these elements\, and how refined abunda
 nce trends in turn sharpen our understanding of nucleosynthetic origins an
 d galactic chemical evolution.\n\nhttps://indico.fysik.su.se/event/9510/
LOCATION:FC61 (AlbaNova Main Building)
URL:https://indico.fysik.su.se/event/9510/
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