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Title:
New f-values in C I and the CNO abundances in the sun
Authors:
Biemont, E.; Hibbert, A.; Godefroid, M.; Vaeck, N.
Affiliation:
AA(Liege Univ., Belgium), AB(Belfast, Queen's Univ., United Kingdom), AC(Bruxelles, Univ. Libre, Brussels, Belgium), AD(Amsterdam Univ., Netherlands)
Publication:
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 412, no. 1, p. 431-435. (ApJ Homepage)
Publication Date:
07/1993
Category:
Solar Physics
Origin:
STI
NASA/STI Keywords:
ABUNDANCE, CARBON, NITROGEN, OXYGEN, SOLAR PHYSICS, STELLAR COMPOSITION, ELECTRON SPIN, ELECTRON TRANSITIONS, LOCAL THERMODYNAMIC EQUILIBRIUM, OSCILLATOR STRENGTHS
DOI:
10.1086/172932
Bibliographic Code:
1993ApJ...412..431B

Abstract

In an attempt to refine our knowledge of the solar abundances of the CNO elements, we discuss the implications of a new accurate set of oscillator strengths recently calculated in intermediate coupling for the 2p(2Po)nl-2p(2Po)(n-prime)(l-prime) E1 transitions of astrophysical interest in C I and also for the forbidden transitions within the 2p-squared ground configuration. As with previous analyses devoted to nitrogen and oxygen, configuration interaction effects have been considered in the calculations in a detailed way and empirical adjustments have been introduced in the diagonal Hamiltonian matrix elements in order to improve the agreement between theoretical eigenvalues and experimental energy differences. The new LTE result, based on a sample of 55 E1 transitions observed in the visible and in the near-IR regions, is A(C) = 8.60 +/- 0.03 in the usual logarithmic scale. Taking departures from LTE into account leads, for a sample of 31 weak lines, to a mean result A(C) = 8.57 +/- 0.03 in agreement with recent determinations.

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