tokens: are associated in a binary system with a large mass ratio. This suggests the existence in the Kepler LEGACY sample of a sizeable fraction of binaries. This is supported by the fact that N17 detected two SB2s in their sample of ten stars from snapshot observations only. It would not be surprising considering the ubiquity of companions in solar-like stars (e.g., Duquennoy Mayor 1991 ). This aspect certainly deserves further investigation (i.e. a dedicated RV monitoring). As guidance for further ensemble seismic modelling of Kepler main-sequence stars, our comparison with the results of (semi-)automatic methods suggests that the study of Buchhave Latham (2015) is a valuable source of effective temperatures and metallicities. For the elemental abundances, the works of Bruntt et al. (2012) and Brewer et al. (2016) appear to be of similar quality for most elements. However, our results tend to be in closer agreement with those of the latter study. We confirm that the ASPCAP effective temperatures used for the APOKASC catalogue are systematically too cool for dwarfs. This is not completely unexpected given that the pipeline is naturally optimised for red giants ( García Pérez et al. 2016 ). The consequence is that a grid-based modelling that makes use of the SDSS photometric T eff scale may be more reliable for relatively unevolved Kepler targets, as already claimed by Serenelli et al. (2017) . However, one can see, in Fig. 12 , the existence of a systematic discrepancy between the SDSS T eff values and those of Brewer et al. (2016) . We find evidence in our sample that the APOKASC metallicities for dwarfs (solely based on ASPCAP) are typically underestimated by ∼0.1 dex. A similar conclusion is reached when considering the data of Brewer et al. (2016) . Correcting for such a bias would lead to a fractional improvement of a few percent in the stellar properties quoted in the APOKASC catalogue (e.g., ∼5% in age; Serenelli et al. 2017 ). As illustrated by our new seismic analysis of KIC 9965715 , even larger changes can be expected if the quality of the classical parameters is mediocre. 10.2. Stellar ages from chemical clocks beyond solar analogues We find that the quality of stellar ages empirically determined from abundance data is currently limited by the precision of the calibrations, which is typically 1.5–2 Gyr when venturing away from stars closely resembling our Sun. Constructing more complex relationships that take into account a dependency on one or two stellar parameters does improve the situation, if only slightly. For instance, incorporating T eff as an additional variable globally improves the agreement between the abundance- and seismic-based ages for the APOKASC stars studied by Brewer et al. (2016) . The calibrations presently available appear significantly less precise than what can be achieved for stars akin to the Sun (precision often below 1 Gyr), but some abundance ratios may hopefully prove more suitable than others outside
ner_tags: O O O O O O O O O O O O O O O O O B-Dataset I-Dataset I-Dataset O O O O O O O O O O O O O B-Citation O O O O O O O O O O O O O O O O O O O O O O O O B-EntityOfFutureInterest O O B-Citation I-Citation I-Citation O O O O O O O O O O O O O O O O O O O O B-Telescope O O O O O O O O O O O O O O O B-Citation I-Citation I-Citation O O O O O O O O O O O O O O O O B-Citation I-Citation I-Citation I-Citation O B-Citation I-Citation I-Citation I-Citation O O O O O O O O O O O O O O O O O O O O O O O O O O O O B-Survey O O O O O B-Dataset I-Dataset O O O O O O O O O O O O O O O O O O O O O O B-Citation I-Citation I-Citation I-Citation I-Citation O O O O O O O O O O O O O B-Survey O O O O O O O O O O O B-Telescope O O O O O B-Citation I-Citation I-Citation I-Citation O O O O O O O O O O O O O O O O O B-Survey O O O O O O B-Citation I-Citation I-Citation I-Citation O O O O O O O O O B-Dataset O O O O O O B-Survey O O O O O O O O O O O O O O O O B-Citation I-Citation I-Citation I-Citation O O O O O O O O O O O O O O O O O O O O O O O B-Dataset I-Dataset O O O O B-Citation I-Citation I-Citation I-Citation O O O O O O O O O B-CelestialObject I-CelestialObject O O O O O O O O O O O O O O O O O O O O O O O B-EntityOfFutureInterest I-EntityOfFutureInterest O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O B-CelestialObject O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O O B-Dataset O O O B-Citation I-Citation I-Citation I-Citation O O O O O O O O O O O O O O O O O O O B-CelestialObject O O O O O O O O O O O O O O O O O