Companions to sdB stars

Andrzej Baran

Pedagogical University of Cracow, Poland

One of the channels to produce sdB stars requires companions to these stars. This channel easily explain the hydrogen envelope lose and a detection of more sdBs in binaries makes this channel to be very important in evolution of sdB stars. During my talk, I will review our recent progress in finding more sdB stars in binaries or harboring planets. In addition, I will present our newest discoveries of pulsation properties of sdB stars.

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