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Non-LTE Abundances in OB stars: Preliminary Results for 5 Stars in the Outer Galactic Disk

Published online by Cambridge University Press:  23 January 2015

G. A. Bragançca ,
T. Lanz ,
S. Daflon ,
K. Cunha ,
C. D. Garmany ,
J. W. Glaspey ,
M. Borges Fernandes ,
M. S. Oey ,
T. Bensby  and
I. Hubeny
G. A. Bragançca
Affiliation:
Observatório Nacional, Rio de Janeiro, Brazil email: ga.braganca@gmail.com Observatoire de la Côte d'Azur, Nice, France
T. Lanz
Affiliation:
Observatoire de la Côte d'Azur, Nice, France
S. Daflon
Affiliation:
Observatório Nacional, Rio de Janeiro, Brazil email: ga.braganca@gmail.com
K. Cunha
Affiliation:
Observatório Nacional, Rio de Janeiro, Brazil email: ga.braganca@gmail.com Steward Observatory, Tucson, AZ, U.S.A.
C. D. Garmany
Affiliation:
National Optical Astronomy Observatory, Tucson, AZ, U.S.A.
J. W. Glaspey
Affiliation:
National Optical Astronomy Observatory, Tucson, AZ, U.S.A.
M. Borges Fernandes
Affiliation:
Observatório Nacional, Rio de Janeiro, Brazil email: ga.braganca@gmail.com
M. S. Oey
Affiliation:
University of Michigan, Ann Arbor, MI, U.S.A.
T. Bensby
Affiliation:
Lund Observatory, Lund, Sweden
I. Hubeny
Affiliation:
Steward Observatory, Tucson, AZ, U.S.A.
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Abstract

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The aim of this study is to analyse and determine elemental abundances for a large sample of distant B stars in the outer Galactic disk in order to constrain the chemical distribution of the Galactic disk and models of chemical evolution of the Galaxy. Here, we present preliminary results on a few stars along with the adopted methodology based on securing simultaneous O and Si ionization equilibria with consistent NLTE model atmospheres.

Keywords

stars: early-typestars: fundamental parametersstars: abundancesGalaxy: diskGalaxy: abundancesGalaxy: evolution
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Issue S307: New windows on massive stars: asteroseismology, interferometry, and spectropolarimetry , June 2014 , pp. 90 - 91
Copyright
Copyright © International Astronomical Union 2015 

References

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