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Chemical Composition of Halo Field Stars and the Chemical Evolution of the Halo

Published online by Cambridge University Press:  30 March 2016

Francois Spite
Francois Spite*
Affiliation:
Observatoire de Paris, Meudon, France

Extract

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The abundance of the elements in the halo are mostly known from analysis of stellar atmospheres. Data from evolved stars and planetary nebulae have to be used with some caution. I will therefore rely primarily on unevolved cool dwarfs, using other information only as a complement.

I will designate these unevolved cool dwarfs indifferently by the words halo dwarfs or Population II dwarfs; such stars were formerly often called subdwarfs for historical reasons. Remaining in the field of vocabulary, I will call underdeficient an element which is deficient, but by a factor smaller than the general deficiency factor for the other elements. Finally, let us recall the classical notation:

Type
Joint Discussions
Information
Highlights of Astronomy , Volume 6 , 1983 , pp. 119 - 127
Copyright
Copyright © Reidel 1983

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