Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994aj....108.2164g&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 108, no. 6, p. 2164-2182
Astronomy and Astrophysics
Astronomy
18
Absorption Spectra, Abundance, Balmer Series, Calcium, Cyanogen, Globular Clusters, Hydrogen, Iron, Metallicity, Methylidyne, Elliptical Galaxies, Milky Way Galaxy, Spectrophotometry, Spectrum Analysis
Scientific paper
Integrated light spectrophotometry of the cores of 13 Milky Way globular clusters spanning a range in metallicity from (Fe/H) = -2 to nearly solar is used to establish the variation of a number of absorption features and colors as a function of metallicity. Analysis of the line strengths shows that globular clusters form a three or possibly four parameter family. Abundance is the primary component, accounting for 92% or more of the total variance of the sample. The next most significant component is an enhancement of the Balmer lines, consistent with the generation of coalesced binaries in post-core-collapse clusters. An additional component due to CN, CH, and Ca variations is also detected. A smooth spectral sequence in metallicity is interpolated from the spectrophotometry, for use in spectral synthesis studies. The spectral sequence is extrapolated to (Fe/H) = +0.50 to facilitate comparison with giant elliptical galaxies.
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