10.9k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
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19 papers · 2 filters
On the galactic chemical evolution of sulfur
N. Ryde, D. L. Lambert
Sulfur abundances have been determined for ten stars to resolve a debate in the literature on the Galactic chemical evolution of sulfur in the halo phase of the Milky Way. Our anal…
Numerical simulation of the three-dimensional structure and dynamics of the non-magnetic solar chromosphere
Sven Wedemeyer, Bernd Freytag, Matthias Steffen +2
Three-dimensional numerical simulations with CO5BOLD, a new radiation hydrodynamics code, result in a dynamic, thermally bifurcated model of the non-magnetic chromosphere of the qu…
HE0107-5240, A Chemically Ancient Star.I. A Detailed Abundance Analysis
N. Christlieb, B. Gustafsson, A. J. Korn +5
We report a detailed abundance analysis for HE0107-5240, a halo giant with [Fe/H]_NLTE=-5.3. This star was discovered in the course of follow-up medium-resolution spectroscopy of e…
Convection in the atmospheres and envelopes of Pre-Main Sequence stars
J. Montalban, F. D'Antona, F. Kupka +1
The Teff location of Pre-Main Sequence (PMS) evolutionary tracks depends on the treatment of over-adiabaticity. Since the convection penetrates into the stellar atmosphere, also th…
Optical Properties of Complex Dust Grains
A. C. Andersen, J. A. Sotelo, G. A. Niklasson +1
Dust particles in space may appear as clusters of individual grains. The morphology of these clusters could be of a fractal or more compact nature. To investigate how the cluster m…
Three-component modeling of C-rich AGB star winds III. Micro-physics of drift-dependent dust formation
C. Sandin, S. Hoefner
A proper treatment of the non-equilibrium dust formation process is crucial in models of AGB star winds. In this paper the micro-physics of this process is treated in detail, with…
Search for extraterrestrial point sources of neutrinos with AMANDA-II
AMANDA Collaboration, J. Ahrens
We present the results of a search for point sources of high energy neutrinos in the northern hemisphere using AMANDA-II data collected in the year 2000. Included are flux limits o…
Inelastic H+Li and H^-+Li^+ collisions and non-LTE Li I line formation in stellar atmospheres
P. S. Barklem, A. K. Belyaev, M. Asplund
Rate coefficients for inelastic collisions between Li and H atoms covering all transitions between the asymptotic states Li(2s,2p,3s,3p,3d,4s,4p,4d,4f)+H(1s) and Li^+ +H^- are pres…
On the collisional depolarization and transfer rates of spectral lines by atomic hydrogen. III: application to -states of neutral atoms
M. Derouich, S. Sahal-Bréchot, P. S. Barklem
The theory of collisional depolarization of spectral lines by atomic hydrogen (Derouich et al. 2003a; Derouich et al. 2003b) is extended to -atomic levels =3). Depolarizatio…
Outflows and accretion in a star--disc system with stellar magnetosphere and disc dynamo
Brigitta von Rekowski, Axel Brandenburg
The interaction between a protostellar magnetosphere and a surrounding dynamo-active accretion disc is investigated using an axisymmetric mean-field model. In all models investigat…
Outflows from dynamo-active protostellar accretion discs
Brigitta von Rekowski, Axel Brandenburg, Wolfgang Dobler +1
An axisymmetric model of a cool, dynamo-active accretion disc is applied to protostellar discs. Thermally and magnetically driven outflows develop that are not collimated within 0.…
The temporal and spatial evolution of the starburst in ESO 338-IG04 as probed by its star clusters
G. Ostlin, E. Zackrisson, N. Bergvall +1
In this paper we use ultra-violet (UV) and optical HST photometry in five bands, and an extensive set of spectral evolutionary synthesis scenarios to investigate the age and masses…
Can Microlensing Explain the Long-Term Optical Variability of Quasars?
Erik Zackrisson, Nils Bergvall, Thomas Marquart +1
Although controversial, the scenario of microlensing as the dominant mechanism for the long-term optical variability of quasars does provide a natural explanation for both the stat…
Sensitivity of the IceCube Detector to Astrophysical Sources of High Energy Muon Neutrinos
The IceCube Collaboration, J. Ahrens
We present the results of a Monte-Carlo study of the sensitivity of the planned IceCube detector to predicted fluxes of muon neutrinos at TeV to PeV energies. A complete simulation…
Collisional depolarization and transfer rates of spectral lines by atomic hydrogen. II: application to d states of neutral atoms
M. Derouich, S. Sahal-Brechot, P. S. Barklem
The theory of collisional depolarization of spectral lines by atomic hydrogen (Derouich et al. \cite{derouich1}) is extended to =2) atomic levels. Depolarization rates, pol…
Semi-classical theory of collisional depolarization of spectral lines by atomic hydrogen. I: application to p states of neutral atoms
M. Derouich, S. Sahal-Brechot, P. S. Barklem +1
The present paper extends the method of Anstee, Barklem and O'Mara (Anstee 1992; Anstee & O'Mara 1991, 1995; Anstee, O'Mara & Ross 1997; Barklem 1998; Barklem & O'Mara 1997; Barkle…
Three-component modeling of C-rich AGB star winds. II. The effects of drift in long-period variables
C. Sandin, S. Hoefner
We present three-component wind models for carbon rich pulsating AGB stars. In particular we study the effects of drift in models of long-period variables, meaning that the dust is…
Limits on diffuse fluxes of high energy extraterrestrial neutrinos with the AMANDA-B10 detector
J. Ahrens et al.
Data from the AMANDA-B10 detector taken during the austral winter of 1997 have been searched for a diffuse flux of high energy extraterrestrial muon-neutrinos, as predicted from, e…
Abundance Analysis of HE2148-1247, A Star With Extremely Enhanced Neutron Capture Elements
Judith G. Cohen, Norbert Christlieb, Y. -Z. Qian +1
Abundances for 27 elements in the very metal poor dwarf star HE2148-1247 are presented, including many of the neutron capture elements. We establish that HE2148-1247 is a very high…