An automated technique for locating metal-deficient red giants from objective-prism spectra

Details An automated technique for locating metal-deficient red giants from objective-prism spectra An automated technique for locating metal-deficient red giants from objective-prism spectra

Oct 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj....100.1181f&link_type=abstract

Astronomical Journal (ISSN 0004-6256), vol. 100, Oct. 1990, p. 1181-1190.

Astronomy and Astrophysics

Astronomy

12

Abundance, Astronomical Photography, Red Giant Stars, Stellar Spectra, Calibrating, Line Spectra, Metallicity, Photographic Plates

Scientific paper

A semi-automated technique designed to locate metal-weak G and K giants from objective-prism spectra in combination with temperature information from direct plates is described. An accurate wavelength calibration of the spectra made it possible to measure abundance using a line-strength index based on Ca II H and K as a function of color. Criteria based on spectral features between 3500 and 5300 A are described which enable metal-weak giant candidates to be isolated from foreground dwarfs. The technique has been used to locate metal-weak giants in several Galactic fields.

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