Abstract
High-time-resolution photometry of millimagnitude precision using the Fine Error Sensor on board the International Ultraviolet Explorer is presented. A few hours of data, when subjected to an optimal (Bayesian) analysis, reveal two pulsational frequencies in the star IK PegA, one of which was not previously known. A fit to the empirical P-L-C relation identifies the modes (almost) unambiguously, and interpolation from stellar evolution models yields fundamental parameters for this star, which are used to refine the dynamic parameters of its binary companion, a massive white dwarf. A study of an archival Hβ spectrum using spectral synthesis techniques demonstrates that IK Peg A is, in all probability, of normal abundances and should not, therefore, be cited as an example of a star exhibiting pulsation and metallism
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