Theoretically Predicted Color-Magnitude Diagrams for Clusters and the Observations

Abstract

view Abstract Citations (96) References (27) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS Theoretically Predicted Color-Magnitude Diagrams for Clusters and the Observations Schlesinger, Barry M. Abstract Stellar-evolution calculations by Iben have been used to predict the appearance of the color-magni tude diagram for clusters of six different ages. The predicted C-M diagrams are compared with observa- tions. The relative number of stars in different parts of the C-M diagram receives special attention. Comparisons at particular ages help in the interpretation of the available observations An examina- tion of the relation between the luminosity of the stars at the top of the main sequence and that of the stars on the giant branch of young clusters reveals that some of the differences between the C-M dia- grams of Magellanic Cloud clusters and of Galaxy clusters that are usually attributed to composition may be age effects. The possibility of a composition difference between M41 and Ml 1 is discussed. If the distance moduli derived at the time of the original observations were correct, the differences between the C-M diagrams of M41 and Mu indicate a difference in composition. It is suggested that most yellow giants in clusters aged 5 X 108 to 1O~ years are burning core helium Publication: The Astrophysical Journal Pub Date: August 1969 DOI: 10.1086/150093 Bibcode: 1969ApJ...157..533S full text sources ADS |