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• W1995972144 endingPage "140" @default.
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• W1995972144 abstract "We present chromospheric activity index $Srm_{HK}$ measurements for over 13,000 F, G and K disk stars with high signal-to-noise ratio ($>$ 60) spectra in the Sloan Digital Sky Survey (SDSS) Data Release 7 (DR7) spectroscopic sample. A parameter $delta$S is defined as the difference between $Srm_{HK}$ and a `zero' emission line fitted by several of the most inactive stars. The $Srm_{HK}$ indices of subgiant stars tend to be much lower than dwarfs, which provide a way to distinguish dwarfs and giants with relatively low resolution spectra. Cooler stars are generally more active and display a larger scatter than hotter stars. Stars associated with the thick disk are in general less active than those of the thin disk. The fraction of K dwarfs that are active drops with vertical distance from the Galactic plane. Metallicity affects $Srm_{HK}$ measurements differently among F, G and K dwarfs in this sample. Using the open clusters NGC 2420, M67 and NGC6791 as calibrations, ages of most field stars in this SDSS sample range from 3-8 Gyr." @default.
• W1995972144 created "2016-06-24" @default.
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• W1995972144 date "2013-04-10" @default.
• W1995972144 modified "2023-09-24" @default.
• W1995972144 title "TRACERS OF CHROMOSPHERIC STRUCTURE. I. Ca II H&K EMISSION DISTRIBUTION OF 13,000 F, G, AND K STARS IN SDSS DR7 SPECTROSCOPIC SAMPLE" @default.
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• W1995972144 doi "https://doi.org/10.1088/0004-6256/145/5/140" @default.
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