The chemical composition of NGC 288

Details The chemical composition of NGC 288 The chemical composition of NGC 288

Apr 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983pasp...95..229p&link_type=abstract

Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 95, April 1983, p. 229-240.

Astronomy and Astrophysics

Astronomy

28

Abundance, Globular Clusters, Stellar Spectra, Stellar Structure, Atmospheric Models, Helium, Hertzsprung-Russell Diagram, Iron, Oxygen, Tables (Data)

Scientific paper

Analysis of high-resolution spectra of stars in NGC 288 confirm a high overall metal abundance for this cluster, [Fe/H] = -1.0 ± 0.2, as well as an excess of oxygen relative to iron, [O/Fe] = +0.4. A deficiency of ZCNO or oxygen cannot explain the anomalous blue horizontal branch of this cluster, nor can excessive mass loss on the upper giant branch. A high helium abundance or rotation-induced mixing remain as possible alternatives.

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