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  Ages of Dwarfs in the Solar Neighborhood: Considering C and O Enhancements

Xunzhou, C., Zhishuai, G., Yuqin, C., Shaolan, B., Jie, Y., Tanda, L., et al. (2020). Ages of Dwarfs in the Solar Neighborhood: Considering C and O Enhancements. The Astrophysical Journal, 889(2): 157. doi:10.3847/1538-4357/ab66c7.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0006-F53A-5 Version Permalink: https://hdl.handle.net/21.11116/0000-0006-F53B-4
Genre: Journal Article

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 Creators:
Xunzhou, Chen, Author
Zhishuai, Ge, Author
Yuqin, Chen, Author
Shaolan, Bi, Author
Jie, Yu1, Author
Tanda, Li, Author
Yaguang, Li, Author
Ferguson, Ferguson J.W., Author
Jinghua, Zhang, Author
Yaqian, Wu, Author
Affiliations:
1Max Planck Institute for Solar System Research, Max Planck Society, Justus-von-Liebig-Weg 3, 37077 Göttingen, DE, ou_1125546              

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 Abstract: Precise stellar ages of stars are necessary to study the evolution of the Milky Way. The age determination is significantly affected by C and O abundances of stars due to their contribution to the overall metallicity and opacity. On the basis of C and O abundances derived from high-resolution observations, we determine the ages of 148 FGK-type dwarfs in the solar neighborhood by considering C and O enhancements individually. Our results show that using C and O enhancements individually could affect the age determination of the high-α population, especially for stars with [O/α] > 0.2 dex, making them about 1 Gyr younger compared to the results using traditional α-enhanced models. This results in a steeper slope in the age–[α/Fe] relation for the high-α population (changes from 0.0339 ± 0.0075 to 0.0436 ± 0.0086), indicating a higher formation rate. We find no tight relation between age and [α/Fe] or [O/Fe] in the high-α populations. The distribution of space velocity for young α-rich stars shows that they are more likely characterized to the low-α populations.

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Language(s): eng - English
 Dates: 2020
 Publication Status: Issued
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.3847/1538-4357/ab66c7
 Degree: -

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Title: The Astrophysical Journal
Source Genre: Journal
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Publ. Info: Bristol; Vienna : IOP Publishing; IAEA
Pages: - Volume / Issue: 889 (2) Sequence Number: 157 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3