Spectral energy distributions of AT 1997bs. Top panel: SED ∼27 years after the outburst from HST/ACS and JWST/NIRCam observations. The SED is compared to ATLAS9 stellar atmospheric models from Castelli & Kurucz (2003). Good matches are found with models with temperatures between 3750 and 4250 K, and radii between 150 and 120 R_⊙. Middle panel: SED at the time of the 2004 SST observations. This cooler SED is fitted with a DUSTY model with a 100% silicate composition, a dust temperature of T_d = 600 K, a source temperature of T_s = 4000 K, and an optical depth of τ_V = 68.5. Bottom panel: Same but for a model with a 100% AMC composition and optical depth of τ_V = 16.