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Exploring Asteroseismic Relations with Partial Correlation Coefficients along Evolutionary Status KCI 등재 SCOPUS

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  • URLhttps://db.koreascholar.com/Article/Detail/436364
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천문학회지 (Journal of The Korean Astronomical Society)
한국천문학회 (Korean Astronomical Society)
초록

Much effort has been carried out to calibrate and revise asteroseismic relations, given their importance of relations in asteroseismology in determining fundamental parameters of stars. In this study, we statistically explore asteroseismic relations with partial correlation coefficients to determine the most fundamental parameters, separately analyzing asteroseismic data based on the evolutionary status of stars from main sequence up to core helium-burning red-clump stars. We have found that regardless of the evolutionary status of the sampled stars the surface gravity and density of stars strongly influence the observed correlations. More importantly, it is found that indirect correlations derived considering the influence of confounding parameters are subject to the evolutionary status. For example, the observed correlation of the large frequency separation Δν with the central frequency νmax is influenced by the stellar mass, radius, and luminosity only for main sequence stars. The observed correlation of the width of the Gaussian envelope δνenv with νmax is influenced by the stellar mass, effective temperature, radius, and luminosity for main-sequence and subgiant stars. The observed relation between Δν and the small frequency separation δν02 is influenced by the stellar mass, radius, and luminosity for main-sequence and subgiant stars. In contrast, effective temperature, metallicity, and age do not seem to significantly affect the observed correlations. Finally, we conclude by discussing implication of our findings.

목차
Introduction
Sample Selection and Data Analysis
Results 
Discussion and Conclusions
Acknowledgments
References
저자
  • Yun-A Jo(Department of Astronomy, Kyungpook National University, Daegu 41566, Republic of Korea)
  • Heon-Young Chang(Department of Astronomy, Kyungpook National University, Daegu 41566, Republic of Korea) Corresponding author