A calibration of Mg2 versus (Fe/H) and (Mg/Fe)

Details A calibration of Mg2 versus (Fe/H) and (Mg/Fe) A calibration of Mg2 versus (Fe/H) and (Mg/Fe)

Jul 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...430..218b&link_type=abstract

The Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 430, no. 1, p. 218-221

Astronomy and Astrophysics

Astrophysics

51

Abundance, Calibrating, Globular Clusters, Hydrogen, Iron, Magnesium, Metallicity, Red Giant Stars, Stellar Composition, Stellar Spectra, Chemical Evolution, Color-Magnitude Diagram, Galactic Evolution, Mass Ratios, Metallic Stars, Stellar Temperature, Visible Spectrum

Scientific paper

We have computed composite synthetic spectra in the wavelength range lambda lambda 490-540 nm representing globular clusters in the metallicity range -2.0 is less than (Fe/H) is less than +1.0. For the metal-rich ((Fe/H) is approximately greater than 0.0) clusters we magnitude diagram analyses. We show that major points in defining the intensity of lines in the spectral region considered are the temperatures of red giants, and their (Mg/Fe) ratios. The Mg2 index was measured in the synthetic composite spectra, and plots of Mg2 versus (Fe/H) are given for the different assumptions. In particlur, (Mg/Fe) is included as a parameter for the Mg2 calibration.

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