Ratiosof V∞∕Vesc as a functionof log Teff. Early-type (E), mid-type (M), and late-type (L) stars are indicated by blue, green, and red diamonds, respectively. Stars with wind variability are indicated with large open triangles and connected with a solid line. The largest variability is shown by HD 99953, which is located in the region limited by vertical black lines (the bi-stability jump). The shaded areas refer to two zones with different V∞ ∕Vesc: 3.3 for effective temperatures above 23 000 K, and 1.3 below 18 000 K, with errors of 43% and 33%, respectively, which were identified by Markova & Puls (2008).
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