A new class of rapidly pulsating star - III. Oscillations in EC 10228-0905 and pulsation analysis

Details A new class of rapidly pulsating star - III. Oscillations in EC 10228-0905 and pulsation analysis A new class of rapidly pulsating star - III. Oscillations in EC 10228-0905 and pulsation analysis

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997mnras.285..651s&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Volume 285, Issue 3, pp. 651-656.

Other

60

Surveys, Binaries: General, Stars: Individual: Ec 10228-0905, Stars: Oscillations, Subdwarfs, Stars: Variables: Other

Scientific paper

EC 10228-0905 is the third pulsating sdB+ star to be announced. High-speed photometry reveals three periods present in the range P=139-152s with semi-amplitudes of less than 10mmag. All periods show evidence of variable amplitude. Pulsation models have been calculated for sdB stars with log g~6.0 and T_eff~35 000K. These all have radial and non-radial modes with periods in the observed range. No unique mode identification is possible at present, but it is clear that at least some of the modes are non-radial. No stars have been predicted to pulsate in this region of the Hertzsprung-Russell (HR) diagram and the cause of the pulsation is not yet understood.

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