HE 0230−4323 revisited: a new rapidly pulsating sdB star
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Date
2010
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Publisher
Oxford University Press
Abstract
HE 0230−4323 is a hot sdB star in a binary system. An earlier work demonstrated that the
light curve of the system shows a strong (∼4 per cent) reflection effect and also appears to
exhibit photometric variations of the type associated with the slowly pulsating class of sdB star
(multiple periods in the range ∼1–2 h). In this paper, we show that HE 0230−4323 is, in fact,
a rapidly pulsating sdB with at least five frequencies between 3227 and 3532 μHz (periods
between 310 and 283 s). The long periods previously claimed were the result of undersampling
the light curve at a time interval very close to that of the short periods. The interpretation of
the very slow variation (∼0.45 d) as a reflection effect in a close binary is unaffected by these
new results.
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Keywords
Stars: individual: HE 0230−4323, Stars: oscillations, Stars: variables: other
Citation
Kilkenn, D., Koen, C. & Worters, H. (2010). HE 0230−4323 revisited: a new rapidly pulsating sdB star. Monthly Notices of the Royal Astronomical Society, 404(1): 376–380