A&A 587, A66 (2016) Astronomy DOI: 10.1051/0004-6361/201527196 & c ESO 2016 Astrophysics Searching for Li-rich giants in a sample of 12 open clusters Li enhancement in two stars with substellar companions E. Delgado Mena1, M. Tsantaki1,S.G.Sousa1,M.Kunitomo2, V. Adibekyan1,P.Zaworska3, N. C. Santos1,3,G.Israelian4,5, and C. Lovis6 1 Instituto de Astrofísica e Ciências do Espaço, Universidade do Porto, CAUP, Rua das Estrelas, 4150-762 Porto, Portugal e-mail:
[email protected] 2 Department of Physics, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8602 Aichi, Japan 3 Departamento de Física e Astronomia, Faculdade de Ciências, Universidade do Porto, Rua do Campo Alegre, 4169-007 Porto, Portugal 4 Instituto de Astrofísica de Canarias, 38200 La Laguna, Tenerife, Spain 5 Departamento de Astrofísica, Universidad de La Laguna, 38206 La Laguna, Tenerife, Spain 6 Observatoire de Genève, Université de Genève, 51 Ch. des Maillettes, 1290 Sauverny, Switzerland Received 14 August 2015 / Accepted 16 December 2015 ABSTRACT Aims. The aim of this work is to search for Li-rich giants in a sample of clusters where planets have been searched, thus we can study the planet engulfment scenario to explain Li replenishment using a proper comparison sample of stars without detected giant planets. Methods. We derived Li abundances for a sample of 67 red giant stars in 12 different open clusters using standard spectral synthesis techniques and high-resolution spectra (from HARPS and UVES). We also determined masses, ages, and radius from PARSEC stellar isochrones to constrain the evolutionary stage of these stars.