Monthly Archives: June 2012

Oxygen abundance determinations in OB dwarfs and supergiants

Miguel A. Urbaneja (University of Hawaii, Institute for Astronomy, USA) OB type stars are part of a young stellar population in star-forming galaxies that is coeval with H II regions. Their optical spectra present a large number of oxygen lines, … Continue reading

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Oxygen abundance determinations in A-type supergiants: methods and uncertainties

Norbert Przybilla (Dr. Remeis Observatory Bamberg/Univ. Erlangen-Nuremberg, Germany) A-type supergiants are among the visually brightest stars in galaxies. With the current generation of instrumentation high-resolution spectroscopy of individual supergiant stars is feasible throughout the galaxies of the Local Group, and … Continue reading

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Oxygen in cool stars according to CO5BOLD

Hans-­Guenter Ludwig (ZAH -­ Landessternwarte, Germany) In recent years 3D stellar atmosphere models computed with the CO5BOLD code have been applied to determine the abundance of oxygen in cool stars — the Sun and metal-poor stars as prime examples. I … Continue reading

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The Solar oxygen abundance as derived using MHD atmospheric models

Damian Fabbian (Instituto de Astrofísica de Canarias, Spain) We present our initial results on the re-determination of the solar chemical composition using 3D photospheric models that include magnetic fields, a method for the first time employed in determining  the Sun’s … Continue reading

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How accurately can we measure the hydrogen 2S->1S transition rate from the cosmological data?

Viatcheslav Mukhanov (1,2) Jaiseung Kim (3,4) Pavel Naselsky (3,4) TizianaTrombetti (5,6) Carlo Burigana (6,7) ((1) Arnold-Sommerfeld-Center, Department f¨ur Physik, Ludwig-Maximilians-Universit¨at M¨unchen,Theresienstr. 37, D-80333, Munich, Germany; (2) LPT de l’Ecole Normale Superieure, Chaire Blaise Pascal, 24 rue Lhomond, 75231 Paris cedex, … Continue reading

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The Solar oxygen abundance

Martin Asplund (Australian National University, Australia) I will review the solar oxygen abundance. I will also discuss how this relates to helioseismology and the current solar modeling problem. Finally I will present a comparison of the solar O abundance with … Continue reading

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Why we need to map oxygen in the Universe

Nikos Prantzos (Institut d’Astrophysique de Paris, France) I will present an overview of the role of oxygen in the chemical evolution of galaxies. In particular, I will discuss the role of the different observational constraints provided by this element and comment … Continue reading

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