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

Journal Article · Sat Mar 01 00:00:00 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: Univ. of Washington, Seattle, WA (United States)
• OSTI ID: 5430751
• Journal Information: Astrophys. J.; (United States), Vol. 236:2
• Country of Publication: United States
• Language: English

Related Subjects

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