Convection and Overshoot in Models of Doradus and Scuti Stars

Lovekin, Catherine C.; Guzik, Joyce Ann

doi:10.3847/1538-4357/aa8e01

Title: Convection and Overshoot in Models of Doradus and Scuti Stars

Journal Article · Fri Oct 27 00:00:00 EDT 2017 · The Astrophysical Journal (Online)

DOI:https://doi.org/10.3847/1538-4357/aa8e01· OSTI ID:1407896

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Mount Allison Univ., Sackville, NB (Canada); Univ. of California, Santa Barbara, CA (United States). Kavli Inst. for Theoretical Physics
Univ. of California, Santa Barbara, CA (United States). Kavli Inst. for Theoretical Physics; Los Alamos National Lab. (LANL), Los Alamos, NM (United States)

We investigate the pulsation properties of stellar models that are representative of δ Scuti and γ Doradus variables. Here we have calculated a grid of stellar models from 1.2 to 2.2 M ⊙, including the effects of both rotation and convective overshoot using MESA, and we investigate the pulsation properties of these models using GYRE. We discuss the observable patterns in the frequency spacing for p modes and the period spacings for g modes. Using the observable patterns in the g mode period spacings, it may be possible to observationally constrain the convective overshoot and rotation of a model. We also calculate the pulsation constant (Q) for all models in our grid and investigate the variation with convective overshoot and rotation. The variation in the Q values of the radial modes can be used to place constraints on the convective overshoot and rotation of stars in this region. Finally, as a test case, we apply this method to a sample of 22 High-Amplitude δ Scuti stars (HADS) and provide estimates for the convective overshoot of the sample.

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Research Organization:: Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP)

Grant/Contract Number:: AC52-06NA25396

OSTI ID:: 1407896

Report Number(s):: LA-UR-17-25700; TRN: US1702927

Journal Information:: The Astrophysical Journal (Online), Vol. 849, Issue 1; ISSN 1538-4357

Publisher:: Institute of Physics (IOP)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 9 works

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