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

Abstract

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.

Authors:
ORCiD logo [1]; ORCiD logo [2]
  1. Mount Allison Univ., Sackville, NB (Canada); Univ. of California, Santa Barbara, CA (United States). Kavli Inst. for Theoretical Physics
  2. Univ. of California, Santa Barbara, CA (United States). Kavli Inst. for Theoretical Physics; Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA), Office of Defense Programs (DP) (NA-10)
OSTI Identifier:
1407896
Report Number(s):
LA-UR-17-25700
Journal ID: ISSN 1538-4357; TRN: US1702927
Grant/Contract Number:
AC52-06NA25396
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 849; Journal Issue: 1; Journal ID: ISSN 1538-4357
Publisher:
Institute of Physics (IOP)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; stars rotation; stars variables; delta Scuti; stars variables general

Citation Formats

Lovekin, Catherine C., and Guzik, Joyce Ann. Convection and Overshoot in Models of Doradus and Scuti Stars. United States: N. p., 2017. Web. doi:10.3847/1538-4357/aa8e01.
Lovekin, Catherine C., & Guzik, Joyce Ann. Convection and Overshoot in Models of Doradus and Scuti Stars. United States. doi:10.3847/1538-4357/aa8e01.
Lovekin, Catherine C., and Guzik, Joyce Ann. Fri . "Convection and Overshoot in Models of Doradus and Scuti Stars". United States. doi:10.3847/1538-4357/aa8e01.
@article{osti_1407896,
title = {Convection and Overshoot in Models of Doradus and Scuti Stars},
author = {Lovekin, Catherine C. and Guzik, Joyce Ann},
abstractNote = {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.},
doi = {10.3847/1538-4357/aa8e01},
journal = {The Astrophysical Journal (Online)},
number = 1,
volume = 849,
place = {United States},
year = {Fri Oct 27 00:00:00 EDT 2017},
month = {Fri Oct 27 00:00:00 EDT 2017}
}

Journal Article:
Free Publicly Available Full Text
This content will become publicly available on October 27, 2018
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