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Sulfur Abundances in Orion B Stars

Daflon, Simone ; Cunha, Katia ; de la Reza, Ramiro ; Holtzman, Jon ; Chiappini, Cristina

In: Proceedings of the International Astronomical Union, 2009, vol. 5, no. S265, p. 358-359

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    Titre
    • Sulfur Abundances in Orion B Stars
    Auteur
    • Daflon, Simone. Observatório Nacional, Rua General José Cristino 77, CEP 20921-400, Rio de Janeiro, Brazil email:daflon@on.br
    • Cunha, Katia. Observatório Nacional, Rua General José Cristino 77, CEP 20921-400, Rio de Janeiro, Brazil email:daflon@on.br
    • de la Reza, Ramiro. Observatório Nacional, Rua General José Cristino 77, CEP 20921-400, Rio de Janeiro, Brazil email:daflon@on.br
    • Holtzman, Jon. New Mexico State University, 1320 Frenger St., Las Cruces, NM 88003
    • Chiappini, Cristina. Observatoire de Genève, Université de Genève, 51 Chemin des Maillettes, CH-1290 Sauverny, Switzerland
    Type de document
    • Postprint
    Langue
    • Anglais
    Publié dans
    • Proceedings of the International Astronomical Union, 2009, vol. 5, no. S265, p. 358-359. Cambridge University Press
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:298131
    Summary
    Sulfur abundances are derived for a sample of ten B MS star members of the Orion association. The analysis is based on LTE model atmospheres and non-LTE line formation theory by means of spectrum synthesis analysis of Sii and Siii lines. The abundance distribution obtained for the Orion targets is homogeneous within the errors in the analysis: A(S)=7.15±0.05. This abundance result is in agreement with the solar value and with results for the Orion nebula. The sulfur abundances for Orion combined with previous results for other OB-type stars produce a relatively shallow sulfur abundance gradient with a slope of −0.037±0.012 dex Kpc−1