Vidotto, A. AGregory, S. G.Jardine, M.Donati, J. F.Petit, P.Morin, J.Folsom, C. P.Bouvier, J.Cameron, A. C.Hussain, G.Marsden, S.Waite, I. A.Fares, R.Jeffers, S.Nascimento Júnior, José Dias do2020-05-192020-05-192014-02-28VIDOTTO, A. A.; GREGORY, S. G.; JARDINE, M.; DONATI, J. F.; PETIT, P.; MORIN, J.; FOLSOM, C. P.; BOUVIER, J.; CAMERON, A. C.; HUSSAIN, G.. Stellar magnetism: empirical trends with age and rotation. Monthly Notices Of The Royal Astronomical Society, [s.l.], v. 441, n. 3, p. 2361-2374, 19 maio 2014. Oxford University Press (OUP). Disponível em: http://dx.doi.org/10.1093/mnras/stu728. Acesso em: 13 mai. 2020.1678-765X10.1093/mnras/stu728https://repositorio.ufrn.br/jspui/handle/123456789/29016We investigate how the observed large-scale surface magnetic fields of low-mass stars (∼0.1– 2M ), reconstructed through Zeeman–Doppler imaging, vary with age t, rotation and Xray emission. Our sample consists of 104 magnetic maps of 73 stars, from accreting premain sequence to main-sequence objects (1Myr t 10 Gyr). For non-accreting dwarfs we empirically find that the unsigned average large-scale surface field is related to age as t−0.655 ± 0.045. This relation has a similar dependence to that identified by Skumanich, used as the basis for gyrochronology. Likewise, our relation could be used as an age-dating method (‘magnetochronology’). The trends with rotation we find for the large-scale stellar magnetism are consistent with the trends found from Zeeman broadening measurements (sensitive to large- and small-scale fields). These similarities indicate that the fields recovered from both techniques are coupled to each other, suggesting that small- and large-scale fields could share the same dynamo field generation processes. For the accreting objects, fewer statistically significant relations are found, with one being a correlation between the unsigned magnetic flux and rotation period. We attribute this to a signature of star–disc interaction, rather than being driven by the dynamoTechniques - polarimetricStars - activityStars - evolutionStars - magnetic fieldPlanetary systemsStars - rotationarticle