A method for non-linear inversion of the stellar structure applied to gravity-mode pulsators

¹ Department of Astronomy, University of Geneva, Chemin Pegasi 51, 1290 Versoix, Switzerland
e-mail: eoin.farrell@unige.ch
² STAR Institute, Université de Liège, Liège, Belgium
³ School of Mathematics, Statistics and Physics, Newcastle University, Newcastle upon Tyne NE1 7RU, UK
⁴ Institute of Astronomy, KU Leuven, Celestijnenlaan 200D, Leuven 3001, Belgium

Received: 31 January 2024
Accepted: 30 March 2024

Abstract

We present a method for a non-linear asteroseismic inversion suitable for gravity-mode pulsators and apply it to slowly pulsating B-type (SPB) stars. Our inversion method is based on the iterative improvement of a parameterised static stellar structure model, which in turn is based on constraints from the observed oscillation periods. We present tests to demonstrate that the method is successful in recovering the properties of artificial targets both inside and outside the parameter space. We also present a test of our method on the well-studied SPB star KIC 7760680. We believe that this method is promising for carrying out detailed analyses of observations of SPB and γ Dor stars and will provide complementary information to evolutionary models.