Dating young open clusters using δ Scuti stars: Results for Trumpler 10 and Praesepe Pamos Ortega, Giovanni M. Mirouh García Hernández, Antonio Suárez Yanes, Juan Carlos Barceló Forteza, Sebastia Asteroseismology Stars: variables: δ Scuti Open clusters and associations: general Funding support from ‘FEDER/junta de Andalucía-Consejería de Economía y Conocimiento’ under project E-FQM-041-UGR18 by Universidad de Granada. J.C.S., G.M.M. and S.B.F. acknowledge funding support from the Spanish State Research Agency (AEI) project PID2019-107061GB-064. This paper includes data collected with the TESS mission, obtained from the TASC data archive. Funding for the TESS mission is provided by the NASA Explorer Program. STScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. Aims. The main goal of this work is to date young open clusters using δ Sct stars. Seismic indices such as the large separation and the frequency at maximum power can help constrain the models to better characterise the stars. We propose a reliable method to identify some radial modes, which would give us greater confidence in the constraints placed on the models. Methods. We extracted the frequency content of a sample of δ Sct stars belonging to the same open cluster. We estimated the low-order large separation by means of different techniques and the frequency at maximum power for each member of the sample. We used a grid of models built with the typical parameters of δ Sct stars, including mass, metallicity, and rotation as independent variables, and we determined the oscillation modes. We selected the observed frequencies whose ratios match those of the models. Once we established a range of radial modes matching the observed frequencies, mainly the fundamental mode, we added it to the other seismic parameters to derive the stellar ages. Assuming star groups have a similar chemistry and age, we estimated their mean ages by computing a weighted probability density function fit to the age distribution of the seismically constrained models. Results. We estimated the age of Trumpler 10 to be 30-20+30 Myr and that of Praesepe to be 580 ± 230 Myr. In this latter case, we find two apparent populations of δ Sct stars in the same cluster, one at 510 ± 140 Myr and another at 890 ± 140 Myr. This may be due to two different stellar formation events, a variety of rotational velocities among the members in our sample of stars (as rapid rotation may modify the observed large separation) or membership to unresolved binary systems. 2023-09-06T08:04:43Z 2023-09-06T08:04:43Z 2023-07-14 info:eu-repo/semantics/article Pamos Ortega, D., et al. Dating young open clusters using δ Scuti stars: Results for Trumpler 10 and Praesepe. A&A 675, A167 (2023) [https://doi.org/10.1051/0004-6361/202346323] https://hdl.handle.net/10481/84278 10.1051/0004-6361/202346323 eng http://creativecommons.org/licenses/by/4.0/ info:eu-repo/semantics/openAccess Atribución 4.0 Internacional EDP Sciences