Table 3: Model parameters for the central star of SMP 61. Stellar core parameters: Stellar luminosity $L_\star $, temperature $T_\star $ and radius $R_\star $. Wind parameters: mass-loss rate $\dot{M}$, terminal wind velocity $v_\infty $, clumping factor D, and the corresponding transformed radius $R_{\rm t}$. Atmospheric abundances: Mass fractions  $X_{\rm He}$, $X_{\rm C}$, and $X_{\rm O}$ are determined by the model fit (Fig. 3) whereas  $X_{\rm Si}$ is set to a standard LMC value. For  $X_{\rm Fe}$ and $X_{\rm N}$ upper limits are given. The hydrogen mass fraction $X_{\rm H}$ could not be determined in the present analysis. Interstellar parameters: Distance modulus M - m for the LMC, color excess due to interstellar extinction EB-V, and Ly $\alpha $ hydrogen column density $n_{\rm H}$.
$L_\star $ $10^{3.96} L_\odot$ $R_\star $ $0.42~R_\odot$
$T_\star $ $87.5~{\rm kK}$    
$\dot{M}$ $10^{-6.12}~M_\odot~\mbox{yr}^{-1}$ $v_\infty $ $1400~\mbox{km}~\mbox{s}^{-1}$
D 4 $R_{\rm t}$ $4.63~R_\odot$
$X_{\rm H}$ - $X_{\rm He}$ 0.45
$X_{\rm C}$ 0.52 $X_{\rm N}$ < $ 5\times10^{-5}$
$X_{\rm O}$ 0.03 $X_{\rm Si}$ ( $2\times10^{-4}$)
$X_{\rm Fe}$ < $1\times10^{-4}$    
M - m $18.5~{\rm mag}$ $n_{\rm H}$ $1 \times 10^{21}~{\rm cm}^{-2}$
EB-V $0.122~{{\rm mag}}$    


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