Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995a%26a...303..753s&link_type=abstract
Astronomy and Astrophysics, v.303, p.753
Astronomy and Astrophysics
Astrophysics
17
Galaxy: Globular Clusters, Stars: Abundances, Stars: Hr Diagram
Scientific paper
An average integrated spectrum of the nearly-solar metallicity globular clusters NGC6528, NGC6553 and NGC6440 is synthesized in the range 3500<λ<9750A with a library of stellar spectra and constraints provided by the observed colour-magnitude diagram (CMD) of NGC6553. In order to account for the CMD parts below the observational cutoff, we employ a power law mass function with slopes x=-0.5, 1.35 and 2.5. We conclude that the MS contribution amounts to =~15% of the integrated light at 5870A and this minor contribution makes the integrated spectrum basically insensitive to these x values. The dominant components are the Red Giant Branch and the Horizontal Branch with respectively =~60% and =~20% of the flux at λ5870A. The residuals of the observed integrated spectrum with respect to the model suggest that [Fe/H] is slightly subsolar in these globular clusters, whereas [CNO/Fe] is slightly above the solar ratio.
Barbuy Batriz
Bica Eduardo
Dottori Horacio
Ortolani Sergio
Santos Joao F. C. Jr.
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