Ages of Dwarfs in the Solar Neighborhood: Considering C and O Enhancements
Chen,Xunzhou1; Ge,Zhishuai2; Chen,Yuqin3,4; Bi,Shaolan1; Yu,Jie5,6,7; Li,Tanda6,7; Li,Yaguang1; Ferguson J. W.,8; Zhang,Jinghua1; Wu,Yaqian3
Source PublicationThe Astrophysical Journal
AbstractAbstract 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.
KeywordFundamental parameters of stars Chemical abundances Galaxy formation Stellar ages Stellar kinematics
WOS IDIOP:0004-637X-889-2-ab66c7
PublisherThe American Astronomical Society
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Document Type期刊论文
Affiliation1.Department of Astronomy, Beijing Normal University, Beijing 100875, People’s Republic of China;
2.Key Laboratory of Beam Technology of Ministry of Education, Beijing Radiation Center, Beijing 100875, People’s Republic of China;
3.Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, A20 Datun Rd., Chaoyang District, Beijing 100101, People’s Republic of China
4.School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 100049, People’s Republic of China
5.Max Planck Institute for Solar System Research, Justus-von-Liebig-Weg 3, D-37077 Gottingen, Germany
6.Sydney Institute for Astronomy (SIfA), School of Physics, University of Sydney, NSW 2006, Australia
7.Stellar Astrophysics Centre, Department of Physics and Astronomy, Aarhus University, Ny Munkegade 120, DK-8000 Aarhus C, Denmark
8.Department of Physics, Wichita State University, Wichita, KS 67260-0032, USA
Recommended Citation
GB/T 7714
Chen,Xunzhou,Ge,Zhishuai,Chen,Yuqin,et al. Ages of Dwarfs in the Solar Neighborhood: Considering C and O Enhancements[J]. The Astrophysical Journal,2020,889(2).
APA Chen,Xunzhou.,Ge,Zhishuai.,Chen,Yuqin.,Bi,Shaolan.,Yu,Jie.,...&Wu,Yaqian.(2020).Ages of Dwarfs in the Solar Neighborhood: Considering C and O Enhancements.The Astrophysical Journal,889(2).
MLA Chen,Xunzhou,et al."Ages of Dwarfs in the Solar Neighborhood: Considering C and O Enhancements".The Astrophysical Journal 889.2(2020).
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