\begin{table}%t1 \caption{\label{t:dmaparameters}Characteristics of the dynamic atmospheric models used for the modelling (P = pulsating, PM = pulsating and mass-losing).} %%\centerline {\small \begin{tabular}{lll} \hline \hline Model:& P & PM \\ \hline luminosity $L_\star$ [$L_{\odot}$]&4000&4000\\ mass $M_\star$ [$M_{\odot}$]&0.6&0.6\\ effective temperature $T_\star$ [K]&3500&3500\\ metallicity $[$Fe/H$]$ [dex]&$-0.7$&$-0.7$\\ C/O ratio&0.48&0.48\\ \hline radius $R_\star$ [$R_{\odot}$]&172&172\\ surface gravity log($g_\star$ [cm/s$^{2}$])&$-0.25$&$-0.25$\\ \hline piston period $P$ [d]&200&200\\ piston velocity amplitude $\Delta u_{\rm p}$ [km~s$^{-1}$]&2&3\\ luminosity amplitude parameter $f_{\rm L}$ [1] &4&4\\ bolometric variation $\Delta m_{\rm bol}$ [mag]&0.86&1.36\\ dust mass absorption coefficient $\kappa_{\rm d}^{\rm max}$ [cm$^{2}$~g$^{-1}$]&--&5\\ \hline\noalign{\smallskip} mean mass loss rate $\langle\dot M\rangle$ [$M_{\odot}$~yr$^{-1}$]&--&$1.9\times10^{-7}$\\ mean outflow velocity $\langle u \rangle$ [km~s$^{-1}$]&--&19.5\\ \hline \end{tabular}} \tablefoot{The notation was adopted from previous papers (H\"ofner et~al. \cite{HoGAJ03}; Nowotny et~al. \cite{NowAH09}).} \end{table}