If T of the cool star is reduced, its radius must increase in order to conserve the flux due to the cool star in the composite spectrum. Thus, if previous studies are correct, cool companions would have to be more evolved than they appear to be here. Thus, we believe that our measurements of T are consistent with the majority of cool companions of our sample being main sequence stars. As suggested in Sect. Absolute visual magnitudes of some of the cool components of our sample together with measurements from other authors.
T are effective temperatures of cool stars, obtained with our method.
A typical value of is assumed for all sdB stars.