CNO ABUNDANCES OF SOME FIELD HORIZONTAL-BRANCH AND POPULATION I A STARS

From observations of infrared lines we have obtained oxygen and nitrogen abundances of the prototype field horizontal-branch stars HD 109995 and HD 161817, the somewhat similar star HD 64488, and the sharp-lined Population I A stars θ Leo and HR 6559 as well as carbon abundances of HD 161817 and 0 L...

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Published inPublications of the Astronomical Society of the Pacific Vol. 98; no. 606; pp. 783 - 787
Main Authors ADELMAN, SAUL J., HAYES, D. S., PHILIP, A. G. DAVIS
Format Journal Article
LanguageEnglish
Published Legacy CDMS The Astronomical Society of the Pacific 01.08.1986
University of Chicago Press
Subjects
Astronomy
Astrophysics
Carbon
Earth, ocean, space
Exact sciences and technology
Fine structure
Horizontal branch stars
Nitrogen
Normal stars (by class): general or individual
Observational astronomy
Observational research
Oxygen
Population I stars
Stars
Telluric lines
A star
Oxygen
Horizontal branch star
Population I
Abundance
Metal
Nitrogen
Carbon
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Summary:From observations of infrared lines we have obtained oxygen and nitrogen abundances of the prototype field horizontal-branch stars HD 109995 and HD 161817, the somewhat similar star HD 64488, and the sharp-lined Population I A stars θ Leo and HR 6559 as well as carbon abundances of HD 161817 and 0 Leo. The results for HD 161817 may be in accord with the predictions of Sweigart and Mengel for dredge-up during the previous red-giant stage if the non-LTE effects for the I lines have been properly accounted for and those for the I and N I lines are small. This star and HD 109995 are apparently both oxygen and nitrogen poor to the same degree although their iron abundances differ by 0.3 dex.
Bibliography:CDMS
Legacy CDMS
ISSN:0004-6280
1538-3873
DOI:10.1086/131825