August 7-10, 2017

Abstract

BRITE view of Sigma Scorpii, a Beta Cephei-type star studied for over a century

Andrzej Pigulski (University of Wroclaw, Poland)

A.Pigulski (Univerity of Wroclaw, Poland), H.Cugier (Univerity of Wroclaw, Poland), G.Handler (Nicolaus Copernicus Astronomical Center, Warsaw, Poland), R.Kgoadi (University of Johannesburg, South Africa)

Sigma Sco is a quadruple system consisting of B-type stars. Its primary is a Beta Cephei-type star studied for over a century. With BRITE data we reveal 10 pulsation modes of which only four were known earlier. Two of them are g modes which makes the star another Beta Cep/SPB hybrid. We also show that the amplitude of the dominant mode dropped fourfold with respect to the observations made 30-50 years ago. Finally, we present the results of seismic modelling of the star.

Mode of presentation: poster