Cataclysmic Variables as Binary Stars: Then and Now

The Donor Stars of Cataclysmic Variables

We carefully consider observational and theoretical constraints on the global properties of secondary stars in cataclysmic variable stars (CVs). We then use these constraints to construct and test a complete, semi-empirical donor sequence for CVs with orbital periods Porb 6 6 hrs. All key physical and photometric parameters of CV secondaries (along with their spectral types) are given as a func...

Model Atmospheres for Irradiated Stars in Pre-cataclysmic Variables

Model atmospheres have been computed for M dwarfs that are strongly irradiated by nearby hot companions. A variety of primary and secondary spectral types are explored in addition to models specific to four known systems: GD 245, NN Ser, AA Dor, and UU Sge. This work demonstrates that a dramatic temperature inversion is possible on at least one hemisphere of an irradiated M dwarf and the emerge...

The Secondary Stars in Short Period (Magnetic) Cataclysmic Variables

We review the recent knowledge base pertaining to causes for mass accretion variations (high/low states) in highly magnetic cataclysmic variables (i.e. polars). We then examine what theory has to say about the properties of the secondary stars (the mass donors) with respect to those CVs with very short orbital periods. Finally, we use recent observations of EF Eri in an extended low state to pr...

How Evolved are the Mass Donor Stars in Cataclysmic Variables?

Schizophrenia: Then and Now