Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011ess.....2.3002a&link_type=abstract
American Astronomical Society, ESS meeting #2, #30.02
Astronomy and Astrophysics
Astronomy
Scientific paper
Lithium is a very intriguing element. It was created during the Big Bang nucleosynthesis but its primordial abundance is still uncertain. While built into the stars it may be easily destroyed at temperatures of only 2.5 mln. K. It may also be created in late stages of stellar evolution enriching the interstellar medium and next generations of stars. Its appearance in stars is also enigmatic. To much surprise it appears to be present or even overabundant in evolved giant stars (Kumar et al. 2011). Its presence in stellar atmospheres of dwarfs is possibly related with appearance of planetary systems around them (Israelian et al. 2009, Ghezzi et al. 2010). The PennState - Torun Planet Search (PTPS) with 1000 evolved stars is in a very good position to test hypotheses concerning lithium abundance in giants as well as relations between lithium abundance and planets. We found in our sample 8 giants with strong lithium overabundance, 5 of them in the Red Giant Clump sample. Here we present results of lithium abundance analysis in 350 PTPS Red Clump Giants. We compare lithium abundance with binarity, planet presence and stellar parameters like mass, metallicity or age.
Adamów Monika
Niedzielski Andrzej
Wolszczan Alex
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