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K2 observations of the pulsating subdwarf B star EQ Piscium: an sdB+dM binary

K2, the two-wheel mission of the Kepler space telescope, observed the pulsating subdwarf B star EQ Psc during engineering tests in 2014 February. In addition to a rich spectrum of g-mode pulsation frequencies, the observations demonstrate a light variation with a period of 19.2 h and a full amplitude of 2%. We suggest that this is due to reflection from a cool companion, making EQ\,Psc the longest-period member of some 30 binaries comprising a hot subdwarf and a cool dwarf companion (sdB+dM), and hence useful for exploring the common-envelope ejection mechanism in low-mass binaries.

preprint2014arXivOpen access
C. S. JefferyGavin Ramsay
astro-ph.SR
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C. S. JefferyGavin Ramsay

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