Using 2MASS to detect main sequence companions to subdwarf B stars
We explore the binary fraction of subdwarf B (sdB) stars by using the Two Micron All Sky Survey to search for main sequence companions. We have convolved Kurucz models with appropriate filter bandpasses to examine how various combinations separate single sdB stars from sdB+MS binaries. We notice that the 2MASS magnitude limits greatly increase the fraction of inferred sdB+MS binaries and examine a magnitude-limited sample appropriate for single sdB stars.
Reed, M. D., and Rae Stiening. "Using 2MASS to detect main sequence companions to subdwarf B stars." Astrophysics and Space Science 291, no. 3 (2004): 329-332.
Astrophysics and Space Science