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Carbon and Nitrogen in Halo Stars

Published online by Cambridge University Press:  12 April 2016

Christopher Sneden  and
Ruth C. Peterson
Christopher Sneden
Affiliation:
University of Wyoming
Ruth C. Peterson
Affiliation:
Lockheed Solar Observatory

Abstract

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A new study of carbon and nitrogen abundances has been carried out for a sample of halo dwarf stars. This sample was limited to relatively bright high velocity stars with substantial metal deficiencies (-0.65≥[Fe/H]≥ −2.00). Synthesis of CH molecular bands for nine program stars indicates that [c/Fe] = −0.1±0.2 in halo stars. Preliminary results of the NH synthesis in two stars shows discrepant results: a moderate velocity star has [N/Fe]≲ −1.0 while a very high velocity star has [N/Fe]⋍ +0.0. Implications of these abundances for galactic chemical evolution are discussed.

Type
Part III: The Chemical Properties of the Disc and the Halo in our Galaxy
Information
International Astronomical Union Colloquium , Volume 45: Chemical and Dynamical Evolution of our Galaxy , September 1977 , pp. 201 - 204
Copyright
Copyright © Geneva Observatory 1977

References

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