2014MNRAS.443.3477C

EC14012-1446 was observed by Handler et al. in 2004 April, June, 2005 May, and 2007 April, and by Provencal et al. in 2008. We review the observations together and obtain 34 independent frequencies. According to the frequency splitting and the asymptotic period spacing law, we identify 6 l = 1 modes, 4 l = 2 modes, 5 l = 3 modes, 10 l = 1 or 2 modes. Grids of white dwarf models are generated by wdec with H, He, C, O diffusion in a four-parameter space. The core compositions are directly from white dwarf models generated by mesa. The best-fitting model has M* = 0.710 M_☉, Teff = 12 200 K, log(MHe/M*) = -2.5, log(MH/M*) = -7.0, log g = 8.261, and φ = 3.185 s. There are four, two, and one modes identified as trapped in H envelope for observed l = 1, 2, and 3 modes, respectively. Trapped modes jump the queue of uniform period spacing.