Nuevo eventoHow tidal forces & rotation show up on the “Hybrid” pulsation of binary systems with intermediate-mass A/F-type companions – Anya Samadi Ghadim

How tidal forces & rotation show up on the “Hybrid” pulsation of binary systems with intermediate-mass A/F-type companions Anya Samadi Ghadim Universidad Diego Portales Asteroseismology is a formidable tool in astrophysics, which allows us to investigate the interior structure of stars based on phenomena observed at their surface. This knowledge is essential for a detailed understanding of both stellar structure and stellar evolution. ? Dor/? Scuti variables, two subgroups of classical A/F-type pulsators, are intriguing objects with regard to their stellar interior. They are located at the cross-section of the Cepheid instability strip and the main sequence. “Hybrid” stars have both detectable ? Dor (g modes) and detectable ? Scuti (p modes) pulsations in their Fourier spectrum. Pulsation study of these stars delivers very impressive information like the interior rotation rates and stratification properties of stars, only based on unprecedented light curves from space missions like Kepler (K2) and TESS. We expect that a significant fraction of the ? Dor/? Scuti stars resides in binary or multiple systems (MF ? 50%s). The detection of pulsations in binary systems not only provides an additional tool to derive stellar parameters in an independent way but is also the perfect laboratory to check the influence of binarity (e.g. eccentricity, tidal effects, mass transfer, chemical peculiarities, presence of a third body on stellar structure, stellar evolution and the excited oscillation modes.

Horarios: En Septiembre 16, 2020

Publicado por: Patricia Tissera