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A Flatter metallicity gradient in the Galactic disk: non-LTE abundance calculations of OB stars

Published online by Cambridge University Press:  26 May 2016

Simone Daflon  and
Katia Cunha
Simone Daflon
Affiliation:
Observatório Nacional/MCT, Rua Gal. José Cristino 77, São Cristovão, 20921-400 Rio de Janeiro/RJ, Brasil
Katia Cunha
Affiliation:
Observatório Nacional/MCT, Rua Gal. José Cristino 77, São Cristovão, 20921-400 Rio de Janeiro/RJ, Brasil

Abstract

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We present non-LTE abundances of carbon, nitrogen, oxygen, magnesium, aluminum, silicon and sulfur, derived for a sample of 70 O9-B2 main sequence stars of the Galactic disk and analyze the distribution of the chemical abundances in terms of radial gradients within 4.4-12.9 kpc from the center of the Galaxy. The derived gradients are flatter than those presented by the most recent studies about the radial gradients of stellar abundances.

Type
Part 1. Atmospheres of Massive Stars
Information
Symposium - International Astronomical Union , Volume 212: A Massive Star Odyssey: From Main Sequence to Supernova , 2003 , pp. 162 - 163
Copyright
Copyright © Astronomical Society of the Pacific 2003 

References

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