Asteroseismology Applied to Constrain Structure Parameters of δ Scuti Stars

被引:3
|
作者
Panda, Subrata Kumar [1 ]
Dhanpal, Siddharth [1 ]
Murphy, Simon J. [2 ]
Hanasoge, Shravan [1 ]
Bedding, Timothy R. [3 ]
机构
[1] Tata Inst Fundamental Res, Dept Astron & Astrophys, Mumbai 400005, India
[2] Univ Southern Queensland, Ctr Astrophys, Toowoomba, Qld 4350, Australia
[3] Univ Sydney, Sydney Inst Astron SIfA, Sch Phys, Sydney, NSW 2006, Australia
基金
澳大利亚研究理事会; 新加坡国家研究基金会;
关键词
CONVECTIVE BOUNDARIES; PULSATION; MESA; MODULES; FREQUENCY; COROT; MODES; OSCILLATIONS; SEPARATIONS; VARIABLES;
D O I
10.3847/1538-4357/ad0a97
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Asteroseismology is a powerful tool to probe stellar structure. Spaceborne instruments like CoRoT, Kepler, and TESS have observed the oscillations of numerous stars, among which delta Scutis are particularly interesting, owing to their fast rotation and complex pulsation mechanisms. In this work, we inferred model-dependent masses, metallicities, and ages of 60 delta Scuti stars from photometric, spectroscopic, and asteroseismic observations using least-squares minimization. These statistics have the potential to explain why only a tiny fraction of delta Scuti stars pulsate in a very clean manner. We find most of these stars with masses around 1.6 M-circle dot and metallicities below Z = 0.010. We observed a bimodality in age for these stars, with more than half the sample younger than 30 Myr, while the remaining ones were inferred to be older, i.e., hundreds of Myrs. This work emphasizes the importance of the large-frequency separation (Delta nu) in studies of delta Scutis. We also designed three machine-learning (ML) models that hold the potential for inferring these parameters at lower computational cost and much more rapidly. These models further revealed that constraining dipole modes can help in significantly improving age estimation and that radial modes succinctly encode information regarding luminosity and temperature. Using the ML models, we also gained qualitative insight into the importance of stellar observables in estimating mass, metallicity, and age. The effective temperature T eff strongly affects the inference of all structure parameters, and the asteroseismic offset parameter epsilon plays an essential role in the inference of age.
引用
收藏
页数:13
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