Oliveira Junior, Celso Benedito deKrabbe, Angela CristinaHernandez-Jimenez, Jose AndresDors Junior, Oli LuizZinchenko, IgorHägele, Guilhermo FredericoCardaci, Mónica VivianaMonteiro, Adriano Francisco2025-03-142025-03-14https://repositorio.univap.br/handle/123456789/696The ionizing source of low-ionization nuclear emission-line regions (LINERs) is uncertain. Because of this, an empirical relation to determine the chemical abundances of these objects has not been proposed. In this work, for the first time, we derived two semi-empirical calibrations based on photoionization models to estimate the oxygen abundance of LINERS as a function of the N2 and O3N2 emission-line intensity ratios. These relations were calibrated using oxygen abundance estimations obtained by comparing the observational emission-line ratios of 43 LINER galaxies (taken from the MaNGA survey) and grids of photoionization models built with the cloudy code assuming post-asymptotic giant branch stars with different temperatures. We found that the oxygen abundance of LINERs in our sample is in the range, with a mean value of . We recommend the use of the N2 index to estimate the oxygen abundances of LINERs, since the calibration with this index presented a much smaller dispersion than the O3N2 index. In addition, the estimated metallicities are in good agreement with those derived by extrapolating the disc oxygen abundance gradients to the centre of the galaxies showing that the assumptions of the models are suitable for LINERs. We also obtained a calibration between the logarithm of the ionization parameter and the [O iii]/[O ii] emission-line ratio.PDFen-USArtigos de PeriódicosMonthly Notices of the Royal Astronomical Society10.1093/mnras/stac2118ISM: abundancesGalaxies: abundancesGalaxies: nucleiOLIVEIRA JUNIOR, Celso Benedito de et al. Chemical abundance of LINER galaxies – metallicity calibrations based on SDSS-IV MaNGA. Monthly Notices of the Royal Astronomical Society, v. 515, n. 4, p. 6093-6108, 2022. Disponível em:Universidade do Vale do ParaíbaLudwig-Maximilians-UniversitätUniversidad Nacional de La PlataInstituto Federal do Maranhão