Abstract
Simultaneous radial velocity and photometric observations are reported for the variable extreme helium star HD 160641. Pulsation in the 1 = 4 mode could explain the observed variations; the corresponding Wesselink radius would be 8 ± 2 R®. The consequent luminosity of log (L/L®) = 4.8 ± 0.2 would be consistent with Schonberner’s evolutionary model for a 1 W® extreme helium star.
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