Calibration of metallicity effects on the integrated colors of globular clusters and early-type galaxies

Details Calibration of metallicity effects on the integrated colors of globular clusters and early-type galaxies Calibration of metallicity effects on the integrated colors of globular clusters and early-type galaxies

Aug 1978

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1978apj...223..824a&link_type=abstract

Astrophysical Journal, Part 1, vol. 223, Aug. 1, 1978, p. 824-834. Research supported by the Massachusetts Institute of Technol

Astronomy and Astrophysics

Astrophysics

184

Abundance, Galactic Evolution, Globular Clusters, Metals, Broadband, Calibrating, Color, Infrared Spectra, Least Squares Method, Star Distribution

Scientific paper

IR observations of 42 globular clusters are presented which, in combination with broadband optical colors, provide a strictly empirical calibration of integrated color change with metallicity. Population models with varying metallicity and initial mass function (IMF) are constructed from theoretical isochrones in order to obtain a theoretical fit to the globular-cluster data. The model results are then compared with observations of early-type galaxies to determine the most likely values of metallicity and the parameter s (s = 1 + x, where x is the slope of the IMF) in such galaxies. It is found that: (1) there is a strong correlation between the metallicity of globular clusters and their integrated IR colors; (2) the population models adequately reproduce empirical colors for Z = 0.01; and (3) the location of the centers of early-type galaxies in two-color diagrams forms an extension of the globular-cluster sequence and suggests that galaxies ordered by absolute magnitude are also ordered by metallicity, with the brightest ellipticals being metal-rich.

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