Determining the Age for the Red Giants KIC 9145955 and KIC 9970396 by Gravity-dominated Mixed Modes
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Le résumé fourni par la source
Abstract Determining the ages and helium core sizes of red giants is a challenging problem. To estimate the age and helium core size precisely requires a good understanding of the internal structure of the red giant. The properties of the g-dominated mixed modes of red giants are closely related to their inner radiative cores, especially the central helium core. Thus, the g-dominated mixed modes are useful indicators for probing the properties of the helium core and constraining the age of red giants. In our previous work, we have estimated the helium core sizes of the red giants KIC 9145955 and KIC 9970396 by asteroseismic models. In this work, we take a further step to calibrate the ages and core overshooting parameters for these two red giants. We find that the ages of these two stars are 4.61 ± 0.23 and 6.13 ± 0.19 Gyr, respectively. From a comparative study, we find that, for a single red giant, the age estimated by the asteroseismology of g-dominated mixed modes is likely to be more precise than that estimated by the combination of the asteroseismic (Δν and ΔP obs) and spectroscopic (T eff and [Fe/H]) observations. In addition, we estimate the core overshooting parameters of these two stars. We find that the overshooting parameter f ov of KIC 9145955 and KIC 9970396 was probably overestimated in previous works.
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Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- Determining the Age for the Red Giants KIC 9145955 and KIC 9970396 by Gravity-dominated Mixed Modes
- Date Crossref
- 01/05/2022
- Éditeur
- American Astronomical Society
- Type
- journal-article
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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Macau University of Science and Technology State Key Laboratory of Lunar and Planetary Sciences pays non établi dans la noticeUniversité ou école supérieure
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State Key Laboratory of Lunar and Planetary Sciences pays non établi dans la noticeStructure de recherche
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Chinese Academy of Sciences Center for Astronomical Mega-Science pays non établi dans la noticeOrganisme public
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Yunnan Observatories pays non établi dans la noticeStructure de recherche
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University of Chinese Academy of Sciences pays non établi dans la noticeUniversité ou école supérieure
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Key Laboratory for Structure and Evolution of Celestial Objects pays non établi dans la noticeStructure de recherche
State Key Laboratory of Lunar and Planetary Sciences — Macau University of Science and Technology, State Key Laboratory of Lunar and Planetary Sciences et Center for Astronomical Mega-Science — Chinese Academy of Sciences, avec 3 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.