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VERSION:2.0
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BEGIN:VEVENT
DTSTART;TZID=Atlantic/Canary:20091202T000000
DTEND;TZID=Atlantic/Canary:20091202T010000
UID:iactalks-13
X-WR-CALNAME: IAC Talks: Open Astronomy Seminars
X-ORIGINAL-URL: /iactalks/Talks/view/13
CREATED:2009-12-02T00:00:00+00:00
X-WR-CALDESC: IAC Talks upcomming talks
SUMMARY:Light elements in stars with exoplanets
DESCRIPTION:Light elements in stars with exoplanets\nDr. Elisa Delgado Mena
 \n\nThe surface abundance of lithium on the Sun is 140 times less than pro
 tosolar, yet the temperature at the base of the surface convective zone is
  not hot enough to burn Li. A large range of Li abundances in solar type s
 tars of the same age, mass and metallicity is observed, but theoretically 
 difficult to understand. An earlier suggestion that Li is more depleted in
  stars with planets was weakened by the lack of a proper comparison sample
  of stars without detected planets. Here we report Li abundances for an un
 biased sample of solar-analogue stars with and without detected planets. W
 e find that the planet-bearing stars have less than 1 per cent of the prim
 ordial Li abundance, while about 50 per cent of the solar analogues withou
 t detected planets have on average 10 times more Li. The presence of plane
 ts may increase the amount of mixing and deepen the convective zone to suc
 h an extent that the Li can be burned. We also present Be abundances for a
  sample of stars with and without known planets and discuss the possible r
 elation of these light element with the presence of planetary systems.
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