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dc.contributor.authorZhao, Jingkun
dc.contributor.authorOswalt, Terry D.
dc.contributor.authorRudkin, Mark J.
dc.contributor.authorZhao, Gang
dc.contributor.authorChen, Yuqin
dc.date.accessioned2014-10-14T19:56:17Z
dc.date.available2014-10-14T19:56:17Z
dc.date.issued2011-02-14
dc.identifier.citationZhao, 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)en_US
dc.identifier.urihttp://hdl.handle.net/11141/368
dc.description.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 1Gyr and 5 Gyr, consistent with the results of Pace etal. 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.en_US
dc.language.isoen_USen_US
dc.rightsThis published article is available in accordance with the publisher's policy. It may be subject to U.S. Copyright Law.en_US
dc.rights.urihttp://aas.org/publications/aas-copyright-policyen_US
dc.titleThe chromospheric activity, age, metallicity, and space motions of 36 wide binariesen_US
dc.typeArticleen_US
dc.identifier.doi10.1088/0004-6256/141/4/107


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