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• W1657706660 abstract "We have recalibrated a method for the estimation of stellar metal abundance, parameterized as [Fe/H], based on medium-resolution (1–2 A) optical spectra (the majority of which cover the wavelength range 3700–4500 A). The equivalent width of the Ca II K line (3933 A) as a function of [Fe/H] and broadband B-V color, as predicted from spectrum synthesis and model atmosphere calculations, is compared with observations of 551 stars with high-resolution abundances available from the literature (a sevenfold increase in the number of calibration stars that were previously available). A second method, based on the Fourier autocorrelation function technique first described by Ratnatunga & Freeman, is used to provide an independent estimate of [Fe/H], as calibrated by comparison with 405 standard-star abundances. Metallicities based on a combination of the two techniques for dwarfs and giants in the color range 0.30 ≤ (B-V)0 ≤ 1.2 exhibit an external 1 σ scatter of approximately 0.10–0.20 dex over the abundance range -4.0 ≤ [Fe/H] ≤ 0.5. Particular attention has been given to the determination of abundance estimates at the metal-rich end of the calibration, where our previous attempt suffered from a considerable zero-point offset. Radial velocities, accurate to approximately 10 km s-1, are reported for all 551 calibration stars." @default.
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• W1657706660 date "1999-02-01" @default.
• W1657706660 modified "2023-09-26" @default.
• W1657706660 title "Estimation of Stellar Metal Abundance. II. A Recalibration of the C[CLC]a[/CLC] [CSC]ii[/CSC] K Technique, and the Autocorrelation Function Method" @default.
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• W1657706660 doi "https://doi.org/10.1086/300727" @default.
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