Carlos Saffe
Giant-giant pairs: a high-quality test for the chemical tagging
The most important assumption of chemical tagging is that members of birth clusters should have a homogeneous chemical composition. However, studies of main-sequence binary systems showed that small abundance differences between the components could also exist. Several scenarios have attempted to explain the origin of the differences, such as planet formation, planet engulfment and atomic diffusion. However, none of the models fully explains the observed differences. In particular, giant stars are significantly less sensitive to the effects of diffusion and engulfment than main-sequence stars, thanks to their massive convective envelopes. We then propose to study a sample of giant-giant pairs, a novel approach to explore the origin of the slight differences observed. The giant-giant pairs were carefully selected from a recent Gaia EDR3 binary sample with very similar components, which will allow us to achieve the highest possible precision through a line-by-line differential study. In this way, giant-giant pairs can emerge as a high-quality test for the chemical tagging, also providing a tool to disentangle the origin of the small differences observed.
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Giant-giant pairs: a high-quality test for the chemical tagging
