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

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

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

11 Citations (Scopus)

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 languageEnglish
Pages (from-to)1850-1856
Number of pages7
JournalMonthly Notices of the Royal Astronomical Society
Volume401
Issue number3
DOIs
Publication statusPublished - Jan 2010

Keywords

  • Stars: individual (HE 0218-3437; LB 1516)
  • Stars: oscillations
  • Stars: variables: other

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