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Internal gravity waves in massive stars: II. Frequency analysis across stellar mass

Lookup NU author(s): Professor Tamara Rogers, Dr Riccardo Vanon, Ashlin Varghese, Dr Philipp EdelmannORCiD

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This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).


Abstract

© 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.


Publication metadata

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


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