2008MNRAS.389.1414C

Time resolved spectra of βCep yield the following average results: T_eff= 24000±250 K, logg = 3.91±0.05 and ξ = 8.1±0.9 km/s. Nitrogen, oxygen, neon, aluminium, silicon and sulfur abundances are solar while carbon, magnesium and iron are slightly underabundant. Pulsational amplitudes of ΔT_eff∼ 700 K and Δlogg ∼ 0.2 dex are found from Hβ. The metal lines give similar amplitudes but centred on T_eff∼ 25000 K. An upper limit of 1.0 km/s to the variability of the microturbulence is derived from the Siiii triplet at 455 nm. The radial-velocity amplitude derived from the core of Hβ is ∼15 per cent greater than that from the metal lines.