Study of delta Scuti stars with probable magnetic field

Four cycles of observations with the space telescope TESS have provided high-quality photometric data and have led to discovery of a group of delta Scuti stars that show pulsations at high frequencies (nu> 40 c/d) which are similar to the pulsations of roAp stars. Recent discovery of magnetic field in delta Scuti star HD41641 suggests that there should be more delta Scuti + roAp hybrids. We plan to use high resolution and high SNR polarimetric spectra of delta Scuti stars obtained recently by our team with the spectropolarimeter ESPaDOnS at the CFHT to measure their mean longitudinal magnetic field and to determine their Teff, log(g) and metallicity from analysis of Balmer line profiles. The code ZEEMAN2 will be used to carry out an abundance analysis with the aim of defining features of chemical peculiarity in delta Scuti+roAp hybrid candidates and to study the origin of their chemical peculiarity. The new results will help to establish link between the delta Scuti and roAp pulsators and to better understand their stellar evolution.

Faculty Supervisor:

Viktor Khalack

Student:

Partner:

Taras Shevchenko National University of Kyiv

Discipline:

Physics

Sector:

Aerospace; Education; Artificial Intelligence

University:

Université de Moncton

Program: