Evolving Pulsation of the Slowly Rotating Magnetic β Cep Star ξ¹ CMa

Sean B. Begy , Gregg A. Wade, Gerald Handler, Andrzej Pigulski, James Sikora, Matthew Shultz and the BRITE Team

We report BRITE-Constellation photometry of the β Cep pulsator ξ¹ CMa. Analysis of these data reveals a single pulsation period of 0.2095781(3) d, along with its first and second harmonics. We find no evidence for any other frequencies, limiting the value of this star as a target for magneto-asteroseismology. We employ the 17-year database of RV measurements of ξ 1 CMa to evaluate evidence for the reported change in pulsation period, and interpret this period change in terms of stellar evolution. We measure a rate-of-change of the period equal to 0.009(1) s yr^-1 , consistent with that reported in the literature.

Proceedings of the Polish Astronomical Society, vol. 8, 154-158 (2018)

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