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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20150205T103000
DTEND;TZID=Atlantic/Canary:20150205T113000
UID:iactalks-755
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/755
CREATED:2015-02-05T10:30:00+00:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:SOLAR COMPOSITION AS A REFERENCE FOR STARS
DESCRIPTION:SOLAR COMPOSITION AS A REFERENCE FOR STARS\nDr. Nataliia Shchuk
 ina\n\nThe solar abundance of chemical elements play an important role in 
 addressing such important issues as the formation, structure, and evolutio
 n of the Sun and the solar system, the origin of the chemical elements, th
 e evolution of stars and galaxies. Despite the large number of papers publ
 ished on this issue, debates about the solar composition of the Sun contin
 ue. In this talk we start summarizing the current understanding of the sol
 ar abundances of iron and CNO elements, which play a crucial role on the d
 etermination of the solar metallicity. We then pay especial attention to t
 he impact of the quiet Sun magnetism on the determination of the abundance
 s of these elements. The solar photosphere is significantly magnetized, du
 e to the ubiquitous presence of a small-scale magnetic field whose mean st
 rength is thought to be of the order of 100 gauss. Here we address the pro
 blem of the determination of the abundances of chemical elements taking in
 to account the significant magnetization of the quiet Sun photosphere. To 
 this end, we use 3D models of the quiet solar photosphere resulting from a
  state-of-the-art magneto-convection simulation with small-scale dynamo ac
 tion where the net magnetic flux is zero. We conclude that if the magnetis
 m of the quiet solar photosphere is mainly produced by a small-scale dynam
 o,then its impact on the determination of the solar abundance of iron and 
 CNO elements is negligible.
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