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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
Source PublicationASTRONOMICAL JOURNAL
Volume141Issue:4
AbstractWe 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.
KeywordStars: Activity Stars: Late-type White Dwarfs
DOI10.1088/0004-6256/141/4/107
Indexed BySCI
Language英语
WOS IDWOS:000288256600003
Citation statistics
Cited Times:30[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/7836
Collection光学天文研究部
Affiliation1.Florida Inst Technol, Melbourne, FL 32901 USA
2.Chinese Acad Sci, Natl Astron Observ, Key Lab Opt Astron, Beijing 100012, Peoples R China
Recommended Citation
GB/T 7714
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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