Gauging convective cores in sdB stars with pulsating DA WDs

DE GERÓNIMO, FRANCISCO C.; ALTHAUS, LEANDRO G.; BATTICH, TIARA; CÓRSICO, ALEJANDRO H.

Hendaye

Congreso; 9th Meeting on Hot Subdwarfs and Related Objects; 2019

Asteroseismology of white dwarf stars can lead to a better understanding of the interior of these stars, and therefore, of the processes that build up their chemical profiles. In this work we explore how the pulsational properties of low-mass DA white dwarf (WD) models are altered by different assumptions of the convective boundary-mixing efficiency on the He-burning cores of hot subdwarf stars. We particularly choose the descendants of hot subdwarf stars that are expected to avoid the thermally pulsing phase that also imprint changes on the pulsational properties of the resulting WDs. By concentrating on  low-mass C/O WDs, we are sure of getting rid off the uncertainties introduced by the occurrence of the thermal pulses.