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THE CHROMOSPHERIC ACTIVITY, AGE, METALLICITY, AND SPACE MOTIONS OF 36 WIDE BINARIES
Zhao, J. K.1,2; Oswalt, T. D.1; Rudkin, M.1; Zhao, G.2; Chen, Y. Q.2
2011-04-01
发表期刊ASTRONOMICAL JOURNAL
卷号141期号:4
摘要We present the chromospheric activity (CA) levels, metallicities, and full space motions for 41 F, G, K, and M dwarf stars in 36 wide binary systems. Thirty-one of the binaries contain a white dwarf (WD) component. In such binaries, the total age can be estimated by adding the cooling age of the WD to an estimate of the progenitor's main-sequence lifetime. To better understand how CA correlates to stellar age, 14 cluster member stars were also observed. Our observations demonstrate for the first time that, in general, CA decays with age from 50 Myr to at least 8 Gyr for stars with 1.0 <= V - I <= 2.4. However, little change occurs in the CA level for stars with V - I < 1.0 between 1 Gyr and 5 Gyr, consistent with the results of Pace et al. Our sample also exhibits a negative correlation between the stellar age and metallicity, a positive correlation between the stellar age and W space velocity component, and the W velocity dispersion increases with age. Finally, the population membership of these wide binaries is examined based upon their U, V, W kinematics, metallicity, and CA. We conclude that wide binaries are similar to field and cluster stars in these respects. More importantly, they span a much more continuous range in age and metallicity than is afforded by nearby clusters.
关键词Stars: Activity Stars: Late-type White Dwarfs
DOI10.1088/0004-6256/141/4/107
收录类别SCI
语种英语
WOS记录号WOS:000288256600003
引用统计
被引频次:28[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/7836
专题光学天文研究部
作者单位1.Florida Inst Technol, Melbourne, FL 32901 USA
2.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China
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Zhao, J. K.,Oswalt, T. D.,Rudkin, M.,et al. THE CHROMOSPHERIC ACTIVITY, AGE, METALLICITY, AND SPACE MOTIONS OF 36 WIDE BINARIES[J]. ASTRONOMICAL JOURNAL,2011,141(4).
APA Zhao, J. K.,Oswalt, T. D.,Rudkin, M.,Zhao, G.,&Chen, Y. Q..(2011).THE CHROMOSPHERIC ACTIVITY, AGE, METALLICITY, AND SPACE MOTIONS OF 36 WIDE BINARIES.ASTRONOMICAL JOURNAL,141(4).
MLA Zhao, J. K.,et al."THE CHROMOSPHERIC ACTIVITY, AGE, METALLICITY, AND SPACE MOTIONS OF 36 WIDE BINARIES".ASTRONOMICAL JOURNAL 141.4(2011).
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