SIMBAD references

1999AJ....117..981B - Astron. J., 117, 981-1009 (1999/February-0)

Estimation of stellar metal abundance. II. A recalibration of the Ca II K technique, and the autocorrelation function method.

BEERS T.C., ROSSI S., NORRIS J.E., RYAN S.G. and SHEFLER T.

Abstract (from CDS):

We have recalibrated a method for the estimation of stellar metal abundance, parameterized as [Fe/H], based on medium-resolution (1-2 Å) optical spectra (the majority of which cover the wavelength range 3700-4500 Å). The equivalent width of the Ca II K line (3933 Å) 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.


Abstract Copyright:

Journal keyword(s): Galaxy: Abundances - Galaxy: Halo - Stars: Population II

VizieR on-line data: <Available at CDS (J/AJ/117/981): table4.dat table6.dat refs.dat>

CDS comments: Table 4 : NGC 6297 717 misprint of 6397 717. Stars in NGC 6752 are Cl* NGC 6752 CS, stars in M4 are Cl* NGC 6121 Lee, stars in M3 R-NNN are CL* NGC 5272 S R-R-NN (the first roman numeral, I for Serie I is omitted). Stars in M92 not identified.

Simbad objects: 547

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