Subdwarf B Star Evolutionary Systematics, Conundrums and Cautionary Remarks
Résumé
We examine some of the systematics of different types of sub-dwarf B stars -- short-period sdB+WD binaries, short period sdB+MS binaries, composite spectrum systems and apparently single stars -- using recent results from our ongoing spectroscopic surveys and from asteroseismology, 2MASS photometry and open cluster color-magnitude diagrams. There are a wide variety of puzzles still remaining to be solved before we understand all the details of subdwarf B star formation and evolution.