Astronomy and Astrophysics – Astrophysics
Scientific paper
May 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...246..136m&link_type=abstract
Astrophysical Journal, Part 1, vol. 246, May 15, 1981, p. 136-144.
Astronomy and Astrophysics
Astrophysics
25
Abundance, Giant Stars, Globular Clusters, Late Stars, Spectrum Analysis, Stellar Spectra, Absorption Spectra, Halos, Line Spectra, Stellar Spectrophotometry
Scientific paper
IIDS spectral scans with 9-A resolution have been obtained for giant stars in three outlying halo globular clusters as well as in six inner halo clusters. The observations were concentrated on NGC 7006, a cluster whose horizontal branch is unusually red for its metal abundance, and M2. It is found that significant 3883-A CN band strength variations occur among giant stars in all globular clusters regardless of metal abundance. DDO indices constructed from the spectral data for NGC 7006 stars confirm and extend the anomalous behavior discovered in filter photometry of the cluster's giants. In the IIDS spectra, giants in the outlying clusters appear to have unusually strong G bands relative to giants in inner halo clusters of equivalent UV excess and Ca II strengths. Spectra of five NGC 288 stars indicate that this globular cluster is intermediate in overall metal abundance between M5 and 47 Tuc, and that its horizontal branch is therefore anomalously blue.
Hesser James Edward
McClure Robert D.
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