Browse by author
Lookup NU author(s): Professor Tamara Rogers, Dr Riccardo Vanon, Dr Ashlin Varghese, Dr Philipp EdelmannORCiD
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
© The Authors 2023.Stars that are over 1.6 solar masses are generally known to possess convective cores and radiative envelopes, which allows for the propagation of outwardly travelling internal gravity waves (IGWs). Here, we study the generation and propagation of IGWs in such stars using two-dimensional, fully non-linear hydrodynamical simulations with realistic stellar reference states from the one-dimensional stellar evolution code, Modules for Stellar Astrophysics. Compared to previous similar works, this study utilises radius-dependent thermal diffusivity profiles for five different stellar masses at the middle of the main sequence: 3 M⊙, 5 M⊙, 7 M⊙, 10 M⊙, and 13 M⊙. From the simulations, we find that the surface perturbations are larger for higher masses, but no noticeable trends are observed for the frequency slopes with different stellar masses. The slopes are also similar to the results from previous works. We compared our simulation results with stellar photometric data from a recent survey and we found that for frequency intervals above 8 μHz, there is a good agreement between the temperature frequency slopes from the simulations and the surface brightness variations of these observed stars. This indicates that the brightness variations are caused by core-generated IGWs.
Author(s): Ratnasingam RP, Rogers TM, Chowdhury S, Handler G, Vanon R, Varghese A, Edelmann PVF
Publication type: Article
Publication status: Published
Journal: Astronomy and Astrophysics
Year: 2023
Volume: 674
Print publication date: 01/06/2023
Online publication date: 15/06/2023
Acceptance date: 26/04/2023
Date deposited: 01/08/2023
ISSN (print): 0004-6361
ISSN (electronic): 1432-0746
Publisher: EDP Sciences
URL: https://doi.org/10.1051/0004-6361/202245727
DOI: 10.1051/0004-6361/202245727
Altmetrics provided by Altmetric
