Two new variable sdB stars, HE 0218−3437 and LB 1516
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Date
2010
Journal Title
Journal ISSN
Volume Title
Publisher
Oxford University Press
Abstract
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.
Description
Keywords
Stars: individual: HE 0218−3437, Stars: oscillations, Stars: variables: other, Stars: individual: LB 1516
Citation
Koen, C. et al. (2010). Two new variable sdB stars, HE 0218−3437 and LB 1516. 401: 1850–1856. Monthly Notices of the Royal Astronomical Society, 401(3): 1850-1856