Journal Article

Two new variable sdB stars, HE 0218−3437 and LB 1516

C. Koen, D. Kilkenny, M. L. Pretorius and D. J. Frew

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 401, issue 3, pages 1850-1856
Published in print January 2010 | ISSN: 0035-8711
Published online January 2010 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2009.15761.x
Two new variable sdB stars, HE 0218−3437 and LB 1516

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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.

Keywords: stars: individual (HE 0218−3437; LB 1516); stars: oscillations; stars: variables: other

Journal Article.  4567 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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