Binarity as the Origin of Long Secondary Periods in Red Giant Stars

  title={Binarity as the Origin of Long Secondary Periods in Red Giant Stars},
  author={Igor Soszy'nski and A. Olechowska and Milena Ratajczak and Patryk Iwanek and Dorota M. Skowron and Przemysław Mr{\'o}z and Paweł Pietrukowicz and Andrzej Udalski and Michał K. Szymański and Jan Skowron and Mariusz Gromadzki and Radosław Poleski and Szymon Kozłowski and Marcin Wrona and Krzysztof Ulaczyk and Krzysztof Rybicki},
  journal={The Astrophysical Journal Letters},
Long secondary periods (LSPs), observed in a third of pulsating red giant stars, are the only unexplained type of large-amplitude stellar variability known at this time. Here we show that this phenomenon is a manifestation of a substellar or stellar companion orbiting the red giant star. Our investigation is based on a sample of about 16,000 well-defined LSP variables detected in the long-term OGLE photometric database of the Milky Way and Magellanic Clouds, combined with the mid-infrared data… Expand
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