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Helium, Carbon and Silicon Abundances in the HW VIR Eclipsing Binary Subdwarf-B Primary

Lynas-Gray, A. E.; Mortimore, A. N.

Light curve solutions show HW Vir and PG 1336-018 to be remarkably similar eclipsing binaries. The subdwarf-B (sdB) primary of PG 1336-018 is a pulsator but pulsation is not detected in the sdB primary of HW Vir. Ultraviolet spectra were used to obtain carbon and silicon abundances in the sdB primary of HW Vir; in due course these should be compar…