1998A&A...339..531S

Profiles of the strong lines Ca II 8542Å and Mg I 8806Å together with regions containing Ca I, Fe I and Fe II lines in the spectra of the G8 giant stars µ Peg and λ Peg have been recorded at high resolution and with signal/noise≥100. The wings of the strong lines and the full profiles of intermediate strength lines are consistent with an LTE analysis based on the following sets of atmospheric parameters: for µ Peg: T_eff=5000±50K, logg (g in cm/s²)=2.6±0.1, [M/H]=-0.1±0.05, Microturbulence, ξ=1.4±0.1km/s, Macroturbulence, ζ=3.00±0.13km/s; for λ Peg : T_eff=4800±50K, logg (g in cm/s²)=1.7±0.1, [M/H]=-0.1±0.05 Microturbulence, ξ=1.8±0.2km/s, Macroturbulence, ζ=7.6±0.5km/s. These results, together with Hipparcos parallaxes and recently published photometry, lead to estimates of luminosity, mass and radius. Inferred angular diameters are consistent with a well established empirical relationship but disagree with direct measurements by an interferometric technique.