Title:

  Light Element Abundances in Stars Hosting Planets


Garik Israelian
IAC, Tenerife


Abstract:

I discuss abundances of light elements Li and Be in solar-type
stars with planetary systems.  It is know that planet host stars
are metal rich compared with stars without known planets.
Planet host stars may have abnormal abundances of Li and Be due
to the MS accretion of a protoplanetary matter, stellar activity
caused by interaction with exoplanets and tidal interactions. It
is clear that these stars have a distinct angular momentum
history which may be maped on their atmospheric content of Li
and Be. Observations indicate that there is a possible excess
of  Li depletion in planet host stars and interesting trends for
Be appear too.  Many problems in this field can be understood if
we analyse the isotopic  ratio of  Li6/Li7 in a large number of
planet bearing stars.