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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20230124T170000
DTEND;TZID=Atlantic/Canary:20230124T180000
UID:iactalks-1648
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/1648
CREATED:2023-01-24T17:00:00+00:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:IAU G5 talk: Stellar chemical compositions with 3D non-LTE models
DESCRIPTION:IAU G5 talk: Stellar chemical compositions with 3D non-LTE mode
 ls\nAnish Amarsi\n\nSpectroscopic analyses of stellar chemical composition
 s are       model-dependent, and shortcomings in the models often limit th
 e accuracy of the final       results.  For late-type stars like our 
 Sun, two of the main problems in       present-day methods are that they a
 ssume the stellar atmosphere is a) one-dimensional       (1D) and hydrosta
 tic, and b) satisfies local thermodynamic equilibrium       (LTE).  W
 e can relax these assumptions simultaneously by performing detailed 3D    
    non-LTE radiative transfer post-processing of 3D radiative-hydrodynamic
        model stellar atmospheres.  I shall give a brief overview of t
 his approach, and       illustrate its impact on carbon, oxygen, and iron 
 abundances in late-type stars.
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