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We present a detailed abundance study based on spectroscopic data obtainedwith HARPS of two solar-analogue main targets for the asteroseismologyprogramme of the CoRoT satellite: HD 42618 and HD 43587. The atmosphericparameters and chemical composition are accurately determined through a fullydifferential analysis with respect to the Sun observed with the sameinstrumental set-up. Several sources of systematic errors largely cancel outwith this approach, which allows us to narrow down the 1-sigma error bars totypically 20 K in effective temperature, 0.04 dex in surface gravity, and lessthan 0.05 dex in the elemental abundances. Although HD 42618 fulfils manyrequirements for being classified as a solar twin, its slight deficiency inmetals and its possibly younger age indicate that, strictly speaking, it doesnot belong to this class of objects. On the other hand, HD 43587 is slightlymore massive and evolved. In addition, marked differences are found in theamount of lithium present in the photospheres of these two stars, which mightreveal different mixing properties in their interiors. These results will puttight constraints on the forthcoming theoretical modelling of their solar-likeoscillations and contribute to increase our knowledge of the fundamentalparameters and internal structure of stars similar to our Sun.

Abundance study of the two solar-analogue CoRoT targets HD 42618 and HD 43587 from HARPS spectroscopy