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NLTE Effects on Oxygen Lines

Published online by Cambridge University Press:  30 March 2016

Dan Kiselman
Dan Kiselman*
Affiliation:
The Swedish Royal Academy of Sciences, Stockholm Observatory, SE-133 36 Saltsjöbaden, Sweden

Abstract

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The NLTE effects affecting oxygen-abundance determinations of solar-type stars are discussed. LTE is safe for the forbidden lines. The permitted triplet at 777 nm is expected to show NLTE effects so that assuming LTE overestimates the abundance, but the magnitude of the effects is dependent on the poorly known cross sections of collisional excitation by collisions with neutral hydrogen atoms. Little is known about the NLTE effects on molecular line formation.

Type
II. Joint Discussions
Information
Highlights of Astronomy , Volume 12: Highlights of Astronomy. As presented at the XXIVth General Assembly of the IAU, 2000 , 2002 , pp. 429 - 431
Copyright
Copyright © Astronomical Society of Pacific 2002

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