The chemical composition of the old open cluster Melotte 66 and NGC 2243

Details The chemical composition of the old open cluster Melotte 66 and NGC 2243 The chemical composition of the old open cluster Melotte 66 and NGC 2243

Jun 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...257..640g&link_type=abstract

Astrophysical Journal, Part 1, vol. 257, June 15, 1982, p. 640-655. Research supported by the Consiglio Nazionale delle Ricerch

Astronomy and Astrophysics

Astrophysics

54

Chemical Composition, Late Stars, Open Clusters, Red Giant Stars, Stellar Atmospheres, Stellar Models, Astronomical Catalogs, Helium, Hertzsprung-Russell Diagram, High Dispersion Spectrographs, Horizontal Branch Stars, Spectral Line Width, Stellar Evolution

Scientific paper

The chemical composition of Melotte 66 and NGC 2243 was determined using the high-dispersion spectra of some red giants and a model atmosphere analysis. The two clusters are found to be quite metal poor (Fe/H = 0.7 + or - 0.1 for Melotte 66 and -1.2 + or - 0.1 for NGC 2243), with oxygen perhaps enhanced in NGC 2243. The color-magnitude diagrams of the four old open clusters which have been studied with higher dispersion (M67, NGC 2420, NGC 2243, and Melotte 66) are reanalyzed, and new values for the distance moduli of M67 and Melotte 66 are determined. A helium content of 0.25 + or - 0.3 was estimated from the magnitude of the horizontal branch and the ratio of the horizontal branch stars to red giants, and seems remarkably constant within this sample of clusters. These results suggest that the time scale of the galactic halo collapse is long (5 to 10 billion years), in agreement with recent models.

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