1997A&A...320..913T

A spectroscopic analysis of the G-star located at the centre of Abell 35 leads to a surface gravity logg=3.7±0.5 and an effective temperature T_eff=5300±200K, which are typical of a G8IV spectral type. We estimate a projected rotational velocity of 55±10km/s and deduce a radius 1.5≤R_G≤3.5R_☉ in agreement with the subgiant luminosity class: the star is rapidly rotating, near the break-up as for LoTr5 (Jasniewicz et al. 1996A&A...307..200J). For both late-type central stars of Abell 35 and LoTr5, we show a photospheric enhancement of the barium element which can be understood as caused by the transfer of s-process-overabundant material from the former AGB star which is now the hot star of the binary. These G-stars could be pre-barium stars in detached binary systems.