Physical Sciences and Mathematics Commons^™

The Chromospheric Activity, Age, Metallicty And Space Motions Of 36 Wide Binaries, J. K. Zhao, Terry D. Oswalt, M. Rudkin, G. Zhao, Y. Q. Chen

Publications

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 component. In such binaries the total age can be estimated by adding the cooling age of the white dwarf 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 …