Seminar Fizičkog odsjeka

Asteroseismology is a powerful tool for diagnostic of deep, otherwise not observable interiors of stars by interpreting frequencies, amplitudes and phases of their oscillation modes. Though stellar physics and evolution are well understood in general terms, we still lack important physical ingredients, even for the stars in the core-hydrogen burning phase of the evolution. Present "classical"

observational methods allow to deduce common laws of internal stellar physics with poor relative precision (typically, 20% or worse depending on the physical quantity and type of star). Beside that, it is quite often that we have to deal with parametrised description of some important physical phenomena and assign solar values to the corresponding parameters, though it is hard to believe they are appropriate for stars typically several times as massive as the Sun.

 

In this talk, I would like to focus on both single and binary stars, on those typically twice as massive as the Sun and those with masses around 10 solar masses. A particular focus is made on the shortcomings in the description of various mixing processes (including internal

rotation) taking place near the core of spectral type F pulsating stars. Concerning binary stars, the application of some powerful techniques like spectral disentangling and eclipse mapping is discussed.

 

Voditelj Seminara FO

Hrvoje Buljan