  We report results for the Lorentzian profiles of the Li I, Na I and K I
doublets and the Na I subordinate doublet broadened by helium perturbers for
temperatures up to 3000 K They have been obtained from a fully
quantum-mechanical close-coupling description of the colliding atoms, the
Baranger theory of line shapes and new ab initio potentials for the
alkali-helium interaction. For all lines except the 769.9 nm K I line, the
temperature dependence of the widths over the range 70 < T < 3000 K is
accurately represented by the power law form w=aT^b with 0.37 < b < 0.43. The
769.9 K I line has this form for 500 < T < 3000 K with b = 0.49. Although the
shifts have a more complex temperature dependence, they all have the general
feature of increasing with temperature above T=500 K apart from the 769.9 K I
line whose shift decreases with temperature.
