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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Benchmark Calculations of Atomic Data for Modelling Applications

Klaus Bartschat (Drake University) In recent years, much progress has been achieved in calculating reliable cross-section datasets for electron scattering from atoms and ions, in particular quasi-one and quasi-two electron systems such as H, He, the alkalis, and the alkaline-earth … Continue reading

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Charge exchange and spectroscopy with isolated highly-charged ions

Nicholas D. Guise (NIST), Samuel M. Brewer (University of Maryland), Joseph N. Tan (NIST) Compact ion traps can be useful in facilitating the study and manipulation of highly charged ions isolated in a controlled environment. Various ions of interest, including … Continue reading

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Current Status of Atomic Spectroscopy Databases at NIST

Alexander Kramida, Yuri Ralchenko, Joseph Reader  (National Institute of Standards and Technology) NIST’s Atomic Spectroscopy Data Center maintains several online databases on atomic spectroscopy. These databases can be accessed via the Physical Reference Data  web page. Our main database, Atomic … Continue reading

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