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.
Original language | English |
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Pages (from-to) | 1850-1856 |
Number of pages | 7 |
Journal | Monthly Notices of the Royal Astronomical Society |
Volume | 401 |
Issue number | 3 |
DOIs | |
Publication status | Published - Jan 2010 |
Keywords
- Stars: individual (HE 0218-3437; LB 1516)
- Stars: oscillations
- Stars: variables: other