Exploring the Effects of Detailed Chemical Profiles on the Adiabatic Oscillation Spectrum of sdB Stars: First Results

MILLER BERTOLAMI, M. M.; CÓRSICO, A. H.; ALTHAUS, L. G.

Stellenbosch, Western Cape

Conferencia; Fifth Meeting on Hot Subdwarf Stars and Related Objects; 2011

University of the Western Cape

We present results of an ongoing study of the pulsational properties of sdBstellar models aimed at exploring the consequences of detailed chemical transitions forradial, p− and g− modes. In particular, we focus on the effects of diffusion at the H-Hetransition and of He-burning at the convective cores.We find that diffusion of He and H has a strong impact on the period spectrumof sdBVs stars, leading to less efficient mode trapping. Our results also suggests thatasteroseismology of sdBVs stars might offer a very good opportunity to constrain extramixingprocesses in the He-burning cores of horizontal branch stars.