Empirical-theoretical modeling of Be variable mass-loss via variable

From the results of a decades's simultaneous observations in farUV+visual, the authors now extend preliminary empirical models of normal-B and Be atmospheric structural patterns. Primarily the extension clarifies the cool envelope found in Be but not normal-B. The authors focus on that problem: given a variable photospheric mass-outflow for Be, but not for normal B, do they obtain a cool-envelope uniquely for Be, and what is its character? The authors model sequentially outward from a quasi-thermal photosphere - defined as a gas in thermal-hydrostatic and radiative equilibria (HE,RE), with outflow-velocity U≤q/3, q= [kTeμ]12/ - which is structurally the same for normal-B and Be. Such limit on U ensures no departure from HE exceeds 10%. Photosphere is the deepest region seen at any λ