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

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

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010mnras.401.1850k&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 401, Issue 3, pp. 1850-1856.

Other

4

Stars: Individual (He 0218-3437 Lb 1516), Stars: Oscillations, Stars: Variables: Other

Scientific paper

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.

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