A survey of proper-motion stars. II - Extracting metallicities from high-resolution, low-S/N spectra

Details A survey of proper-motion stars. II - Extracting metallicities from high-resolution, low-S/N spectra A survey of proper-motion stars. II - Extracting metallicities from high-resolution, low-S/N spectra

Oct 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987aj.....94.1066c&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 94, Oct. 1987, p. 1066-1076.

Astronomy and Astrophysics

Astronomy

71

Binary Stars, Metallicity, Radial Velocity, Stellar Atmospheres, Stellar Motions, Stellar Spectra, Emission Spectra, Error Analysis, Stellar Models, Stellar Temperature

Scientific paper

The authors discuss the calculations of a grid of high-resolution synthetic spectra covering λλ5150 - 5250, Teff = 4750, 5000, ..., 6500K, [M/H] = +0.5, 0, ..., -3.0, and gravities of log g = 4.5 or 4.0. They describe a method using χ2 fits with these spectra as templates in the determination of mean line strengths from observed spectra. The authors estimate metallicities for 48 stars whose abundances have been previously determined from high-resolution, high-S/N spectra and conventional fine-analysis techniques. None of the observed spectra are high S/N, yet they result in metallicities with internal scatter of typically 0.1 dex. Comparison with published fine analyses shows excellent agreement (-0.03±0.02 dex) for metal-poor stars, and a small systematic error at higher abundances, which is easily corrected. Metallicities with σ < 0.2 dex are still obtained even when S/N is as low as 3.

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