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    Chemical abundances determined from meteor spectra II. Evidence for enlarged sodium abundances in meteoroids

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    9 pages, 5 figures.-- Printed version published Mar 2004.Erratum (extra references) available at: http://digital.csic.es/handle/10261/10752The relative abundances of sodium in meteoroids have been estimated by averaging the composition of the radiating gas along the fireball path produced during their atmospheric entry. We used the method of thermal equilibrium for 13 fireballs produced by meteoroids mainly of cometary origin. The results show greater sodium abundances than those expected for interplanetary dust particles and chondritic meteorites, and interesting differences from the sodium abundance of 1P/Halley comet dust were also found.We acknowledge the facilities given at the Ondrejov Observatory to develop part of this research. JMT-R is grateful to the Spanish State Secretary of Education and Universities for a postdoctoral grant. JLl is grateful to MCYT for a Ramón y Cajal Research Programme grant and to DURSI (Generalitat de Catalunya).Peer reviewe
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