Carbon, nitrogen, and oxygen abundances in 11 G and K giants

Journal Article · Sat Oct 15 04:00:00 EDT 1977 · Astrophys. J.; (United States)

DOI:https://doi.org/10.1086/155599· OSTI ID:5442661

Lambert, D L; Ries, L M

Carbon, nitrogen, and oxygen abundances have been determined for 11 G and K giants. High-resolution photoelectric scans of C/sub 2/, CH, CN, (O I), and (C I) lines have been combined with recent model atmospheres. Relative to the solar atmosphere, the C abundances are depressed, the N abundances enhanced, and the O abundances unchanged. The observed CNO abundances and the previously obtained /sup 12/C//sup 13/C ratios are in good agreement with the predictions for a giant after the convective envelope has mixed material to the surface from the zone which was partially processed during the star's main-sequence lifetime. These are the first results to demonstrate this agreement between theory and observation.

• Research Organization: McDonald Observatory and Department of Astronomy, University of Texas, Austin
• OSTI ID: 5442661
• Journal Information: Astrophys. J.; (United States), Journal Name: Astrophys. J.; (United States) Vol. 217:2; 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
CARBON
CHEMICAL COMPOSITION
CRYOGENIC FLUIDS
ELEMENTS
FLUIDS
FUNCTIONS
GIANT STARS
ISOTOPE RATIO
MATHEMATICAL MODELS
NITROGEN
NONMETALS
OXYGEN
RED GIANT STARS
SPECTRAL FUNCTIONS
STAR MODELS
STARS
STELLAR ATMOSPHERES