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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20220322T170000
DTEND;TZID=Atlantic/Canary:20220322T180000
UID:iactalks-1566
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/1566
CREATED:2022-03-22T17:00:00+00:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:IAU G5 talk: Inelastic hydrogen collisions in stellar atmospheres 
DESCRIPTION:IAU G5 talk: Inelastic hydrogen collisions in stellar atmospher
 es \nDr. Paul S.  Barklem\n\nAccurate non-LTE modelling of stellar spectra
 , and thus the derivation  of accurate stellar properties such as chemical
  composition,  temperature, and surface gravity, depends on reliable atomi
 c data.   While inelastic electron collisions are very important even
  in FGK  stars, the relative importance of the more abundant yet less effi
 cient  hydrogen collisions has for a long time been a major source of  unc
 ertainty.  Over the last decades, considerable progress has been made
   on the theoretical side, as well as with experiments for the important  
 charge transfer processes involving hydrogen, both covering a  significant
  number of astrophysically important atoms.  I will review  this prog
 ress, and discuss where further progress might be needed.
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