Browsing by Author "Frew, D.J."

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    Two new variable sdB stars, HE 0218−3437 and LB 1516
    (Oxford University Press, 2010) Koen, Chris; Kilkenny, David; Pretorius, M.L.; Frew, D.J.
    We present photometry which shows that two known hot subdwarf stars, HE 0218−3437 and LB 1516, are variable. LB 1516 exhibits several frequencies in the range 12–25 cycles d−1 (periods of about 1–2 h) with amplitudes less than about 0.003 mag and appears to be a typical slowly pulsating sdB star. Results from a multisite campaign on HE 0218−3437 show the presence of two frequencies only, the lower amplitude variation an apparent subharmonic of the higher amplitude periodicity. It is likely that the star is in a binary system, and that the variability is due to ellipsoidal deformation of the primary star.