Long-term eclipse timing of white dwarf binaries: an observational hint of a magnetic mechanism at work
作者： Madelon CP Bours , TR Marsh , SG Parsons , VS Dhillon , RP Ashley
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摘要: We present a long-term programme for timing the eclipses of white dwarfs in close binaries to measure apparent and/or real variations their orbital periods. Our includes 67 binaries, both detached and semi-detached with M-dwarfs, K-dwarfs, brown or secondaries. In total, we have observed more than 650 dwarf eclipses. use this sample search period aim identify underlying cause these variations. find that probability observing increases significantly observational baseline. particular, all baselines exceeding 10 yr, secondaries spectral type K2 – M5.5, show eclipse arrival times most cases amount several minutes. addition, among those shorter late (>M6), appear no This is agreement so-called Applegate mechanism, which proposes magnetic cycles secondary stars can drive variability binary orbits. also new NN Ser, are still compatible previously published circumbinary planetary system model, although only addition quadratic term ephemeris. Finally, conclude limited by relatively short baseline many programme, therefore cannot yet draw robust conclusions about evolved, binaries.
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