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Time resolved spectra of $\beta$ Cep yield the following average results:T$_{\rm eff}$ =24000 $\pm$ 250 K, $\log g$ = 3.91 $\pm$ 0.05 and $\xi$ = 8.1$\pm$ 0.9 km s$^{-1}$. N, O, Ne, Al, Si and S abundances are solar while C, Mgand Fe are slightly under-abundant. Pulsational amplitudes of $\Delta$T$_{\rmeff}$ $\sim$ 700 K and $\Delta$$\log g$ $\sim$ 0.2 dex are found from H$\beta$.The metal lines give similar amplitudes but centred on T$_{\rm eff}$ $\sim$25000 K. An upper limit of 1.0 km s$^{-1}$ to the variability of themicroturbulence is derived from the Si {\sc iii} triplet at 455 nm. The radialvelocity amplitude derived from the core of H$\beta$ is $\sim$ 15% greater thanthat from the metal lines.

The spectroscopic variability of T$_{\rm eff}$ and $\log g$ in $\beta$ Cep