Collet, RemoHayek, WolfgangAsplund, Martin2026-01-012026-01-0197805211973971743-9213https://hdl.handle.net/1885/733798894We study the effects of different approximations of scattering in 3D radiationhydrodynamics simulations on the photospheric temperature stratification of metal-poor red giant stars. We find that assuming a Planckian source function and neglecting the contribution of scattering to extinction in optically thin layers provides a good approximation of the effects of coherent scattering on the photospheric temperature balance.2enConvectionHydrodynamicsMethods: numericalRadiative transferScatteringStars: atmospheresThe effect of scattering on the temperature stratification of 3d model atmospheres of metal-poor red giants201010.1017/S174392131101785684882742518