The continuum flux distribution for Arcturus

A composite of all continuum flux data for Arcturus has been plotted including additional results obtained recently in Israel. The data are compared with flux distributions calculated from Carbon & Gingerich, and Peytremann grids of models. There is not good agreement between the calculated and observed flux distributions at shorter wavelengths, but the Peytremann model seems considerably better than the Carbon & Gingerich model. The origin of the discrepancy is discussed and a compromise value of |Tₑ=4500 K₋₁₂₀^°⁺⁵⁰^°| suggested. The need for accurate spect,rophotometry and an improved model atmosphere is stressed.