Chemical composition of stars in globular clusters: M5, M13, and M3

Journal Article · Sat Mar 01 04:00:00 EST 1980 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/157768· OSTI ID:5430751

Pilachowski, C A; Wallerstein, G; Myckky Leep, E

The composition of giant stars in the globular clusters M3, M5, and M13 have been determined by detailed model atmosphere analysis; the average iron deficiencies relative to the Sun are -1.55, -1.33, and -1.42, respectively. Oxygen is overabundant relative to iron in M3 and M5 but not in M13. Differences in the oxygen abundance can account for variation in horizontal-branch morphology; clusters of intermediate metallicity with high oxygen have red horizontal-branch stars, and those with low oxygen have only blue horizontal-branch stars Z/sub cno/ is the second abundance parameter.

• Research Organization: University of Washington
• OSTI ID: 5430751
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 236:2; ISSN ASJOA
• Country of Publication: United States
• Language: English

Related Subjects

640102* -- Astrophysics & Cosmology-- Stars & Quasi-Stellar
Radio & X-Ray Sources
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABUNDANCE
ATMOSPHERES
CHEMICAL COMPOSITION
CRYOGENIC FLUIDS
DIAGRAMS
ELEMENTS
ENERGY SPECTRA
FLUIDS
GIANT STARS
IRON
MATHEMATICAL MODELS
METALS
NONMETALS
OPTICAL DEPTH CURVE
OXYGEN
SPECTRA
SPECTROSCOPIC CURVE OF GROWTH
STAR CLUSTERS
STAR EVOLUTION
STAR MODELS
STARS
STELLAR ATMOSPHERES
TRANSITION ELEMENTS