Super Metal-rich Stars in the LAMOST Survey: A Test on Radial Migration
Chen,Y. Q.1,2; Zhao,G.1,2; Zhao,J. K.1; Liang,X. L.1,2; Wu,Y. Q.1; Jia,Y. P.3; Tian,H.1; Liu,J. M.1
Source PublicationThe Astronomical Journal
AbstractAbstract Super metal-rich stars with [Fe/H]?>?0.4 are selected from LAMOST DR6, and two groups, the blue and the red, are found in the Teff versus logg diagram with a temperature gap between them. In combination with Gaia DR2, stellar positions, velocities, and orbits are calculated, and spatial distributions, kinematical properties, and orbital parameters are compared between the two groups. The blue group shows mainly thin-disk kinematics and spans a wide R range of 6–12 kpc, while the red group has both the thin-disk and the thick-disk kinematics with a narrower range of R?=?6–10 kpc. The kinematical and orbital parameters of stars in the blue group indicate that they could belong to the young population with age less than 1 Gyr, rather than blue stragglers of the old population. The orbital parameters, Rp, Ra, and Rg, of the red group with the thick-disk kinematics are smaller than those with the thin-disk kinematics. The distributions of birth radius and migration distance indicate that radial migration is a favorable origin for the red group, especially those with the thick-disk kinematics, but not for the blue group. The relative magnitude of radial migration is of 51% for the whole sample and of 64% for the red group only. The corotation radial migration caused by the bars and spiral arms at resonances is the most likely mechanism for explaining these properties of SMR stars in this work.
KeywordMilky Way dynamics Milky Way evolution Milky Way disk
WOS IDIOP:0004-6256-158-6-ab5283
PublisherThe American Astronomical Society
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Document Type期刊论文
Affiliation1.Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences, A20 Datun Road, Chaoyang District, Beijing, 100101, People's Republic of China
2.School of Astronomy and Space Science, University of Chinese Academy of Sciences, Beijing 101408, People's Republic of China
3.School of Physics, Shangqiu Normal University, Shangqiu, 476000, People's Republic of China
First Author AffilicationNational Astronomical Observatories, Chinese Academy of Sciences
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Chen,Y. Q.,Zhao,G.,Zhao,J. K.,et al. Super Metal-rich Stars in the LAMOST Survey: A Test on Radial Migration[J]. The Astronomical Journal,2019,158(6).
APA Chen,Y. Q..,Zhao,G..,Zhao,J. K..,Liang,X. L..,Wu,Y. Q..,...&Liu,J. M..(2019).Super Metal-rich Stars in the LAMOST Survey: A Test on Radial Migration.The Astronomical Journal,158(6).
MLA Chen,Y. Q.,et al."Super Metal-rich Stars in the LAMOST Survey: A Test on Radial Migration".The Astronomical Journal 158.6(2019).
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