Modelling δ Scuti pulsations: a new grid of p, g, and f modes across pre-main-sequence to post-main-sequence evolution
Article
Gautam, Anuj, Murphy, Simon J. and Bedding, Timothy R.. 2026. "Modelling δ Scuti pulsations: a new grid of p, g, and f modes across pre-main-sequence to post-main-sequence evolution." Monthly Notices of the Royal Astronomical Society. 545 (4). https://doi.org/10.1093/mnras/staf2001
| Article Title | Modelling δ Scuti pulsations: a new grid of p, g, and f modes across pre-main-sequence to post-main-sequence evolution |
|---|---|
| ERA Journal ID | 1074 |
| Article Category | Article |
| Authors | Gautam, Anuj, Murphy, Simon J. and Bedding, Timothy R. |
| Journal Title | Monthly Notices of the Royal Astronomical Society |
| Journal Citation | 545 (4) |
| Article Number | staf2001 |
| Number of Pages | 28 |
| Year | 2026 |
| Publisher | Oxford University Press |
| Place of Publication | United Kingdom |
| ISSN | 0035-8711 |
| 1365-2966 | |
| Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/staf2001 |
| Web Address (URL) | https://academic.oup.com/mnras/article/545/4/staf2001/8422767 |
| Abstract | Space-based photometry reveals regular high-frequency patterns in many young Scuti stars. These pulsations provide a powerful means of inferring stellar properties, particularly ages, for young Scuti stars for which traditional age-dating methods are poorly constrained. Realizing this potential requires theoretical models that capture the complexities of stellar structure and evolution. We present a comprehensive grid of 25 million stellar pulsation models, computed using the MESA stellar evolution code and the GYRE stellar oscillation code, tailored to Scuti stars. The grid spans a wide range of masses, metallicities, and rotation velocities, and covers evolutionary phases from the early pre-main-sequence through the main sequence (MS) and into the post-main-sequence contraction phase. For each model, we computed adiabatic pulsation frequencies for degrees ─3, capturing p modes, g modes, f modes, and their interactions through avoided crossings. We find that f and low-order g modes have mode inertias comparable to or lower than the fundamental radial mode during the late pre-MS and early MS, implying that these modes should be observable. We revisit Scuti scaling relations and map asteroseismic observables, including the large frequency separation () and phase offset parameter (), across age, mass, metallicity, and rotation. This new model grid, which is publicly available, improves upon previous such model grids by facilitating interpretation of Scuti pulsations, allowing for more reliable age estimates and tighter constraints on stellar evolutionary pathways, and planet formation in A- and F-type stars. |
| Keywords | asteroseismology –stars; evolution –stars; fundamental parameters –stars; oscillations –stars; pre-main- sequence –stars; variables: δScuti |
| Contains Sensitive Content | Does not contain sensitive content |
| ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
| Byline Affiliations | Centre for Astrophysics |
| University of Sydney |
Permalink -
https://research.usq.edu.au/item/101510/modelling-scuti-pulsations-a-new-grid-of-p-g-and-f-modes-across-pre-main-sequence-to-post-main-sequence-evolution
Download files
13
total views1
total downloads13
views this month1
downloads this month