The solitary g-mode frequencies in early B-type stars

J. Daszyńska-Daszkiewicz, P. Walczak, A. Pamyatnykh, M. Jerzykiewicz, A. Pigulski and the BRITE Team

We present possible explanations of pulsations in early B-type main sequence stars which arise purely from the excitation of gravity modes. There are three stars with this type of oscillations detected from the BRITE light curves: κ Cen, a Car, and κ Vel. We show that by changing metallicity or the opacity profile it is possible in some models to dump pressure modes keeping gravity modes unstable. Other possible scenario involves pulsations of a lower mass companion.

Proceedings of the Polish Astronomical Society, vol. 5, 138-144 (2017)

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