Carbon abundances in red giant stars in the globular clusters M92 and NGC 6397

1979 ◽  
Vol 229 ◽  
pp. 604 ◽  
Author(s):  
R. A. Bell ◽  
R. J. Dickens ◽  
B. Gustafsson
Keyword(s):  
Globular Clusters ◽  
Giant Stars ◽  
Red Giant Stars ◽  
Red Giant

Chemical Compositions of Red Giant Stars in Old Large Magellanic Cloud Globular Clusters

2006 ◽  
Vol 640 (2) ◽  
pp. 801-822 ◽  
Author(s):  
Jennifer A. Johnson ◽  
Inese I. Ivans ◽  
Peter B. Stetson
Keyword(s):  
Globular Clusters ◽  
Large Magellanic Cloud ◽  
Magellanic Cloud ◽  
Chemical Compositions ◽  
Giant Stars ◽  
Red Giant Stars ◽  
Red Giant

Ratio of Horizontal Branch Stars to Red Giant Stars in Globular Clusters

Nature ◽  
1969 ◽  
Vol 224 (5223) ◽  
pp. 1006-1008 ◽  
Author(s):  
ICKO IBEN ◽  
ROBERT T. ROOD ◽  
KAREN M. STROM ◽  
STEPHEN E. STROM
Keyword(s):  
Globular Clusters ◽  
Horizontal Branch ◽  
Giant Stars ◽  
Horizontal Branch Stars ◽  
Red Giant Stars ◽  
Red Giant

High-resolution spectra of stars in globular clusters. VI - Oxygen-deficient red giant stars in M13

1991 ◽  
Vol 101 ◽  
pp. 1693 ◽  
Author(s):  
Jeffery A. Brown ◽  
George Wallerstein ◽  
J. B. Oke
Keyword(s):  
High Resolution ◽  
Globular Clusters ◽  
Giant Stars ◽  
Red Giant Stars ◽  
Red Giant

scholarly journals On the Number Ratio of Horizontal Branch Stars to Red Giant Stars in Globular Clusters

1981 ◽  
Vol 93 ◽  
pp. 284-284
Author(s):  
N. Arimoto ◽  
M. Simoda
Keyword(s):  
Globular Clusters ◽  
Big Bang ◽  
Helium Abundance ◽  
Horizontal Branch ◽  
Giant Stars ◽  
Horizontal Branch Stars ◽  
Significant Difference ◽  
Red Giant Stars ◽  
The Difference ◽  
Red Giant

The number ratios of horizontal branch stars to red giant stars were obtained for globular clusters and Draco dwarf galaxy and the helium abundance was estimated using model results without semiconvection zone (SCZ) and with fully developed one. The analysis was confined to the four clusters (M4, M5, M13, and 47 Tuc) and the Draco galaxy, for which fairly precise star counts had been carried out. The effect of the difference in radial distribution between horizontal and red giant branch stars were taken into account, if necessary. The statistically significant difference in R exists among these objects. The cause may be the difference in the helium abundance and/or in the development of the SCZ. In the case of the fully developed SCZ, the helium abundance for M5 and Draco is appreciably smaller than the value given by the big-bang cosmology. It may be taken as an evidence against the full development of the SCZ for the horizontal branch stars in these objects.

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