Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- Centre National de la Recherche ScientifiqueFR2.2k papers
- University of OxfordGB2.1k papers
- Johannes Gutenberg University MainzDE2.1k papers
- University of ManchesterGB2.1k papers
- Stockholm UniversitySE2k papers
- University of Science and Technology of ChinaCN1.9k papers
- Istituto Nazionale di Fisica Nucleare, Laboratori Nazionali di FrascatiIT1.8k papers
- Joint Institute for Nuclear ResearchRU1.7k papers
- University of BonnDE1.7k papers
- Indiana University BloomingtonUS1.7k papers
- Institut National de Physique Nucléaire et de Physique des ParticulesFR1.6k papers
- Aix-Marseille UniversitéFR1.6k papers
17 papers · 2 filters
Interstellar extinction by fractal polycrystalline graphite clusters?
A. C. Andersen, J. A. Sotelo, V. N. Pustovit +1
Certain dust particles in space are expected to appear as clusters of individual grains. The morphology of these clusters could be fractal or compact. To determine how these struct…
The influence of dust properties on the mass loss in pulsating AGB stars
A. C. Andersen, S. Hoefner, R. Loidl
We are currently studying carbon based dust types of relevance for carbon-rich AGB stars, to obtain a better understanding of the influence of the optical and chemical properties o…
Europium abundances in F and G disk dwarfs
A. Koch, B. Edvardsson
Europium abundances for 74 F and G dwarf stars of the galactic disk have been determined from the 4129.7 A Eu II line. The stars were selected from the sample of Edvardsson et al.…
Spectroscopic Signatures of Convection in the Spectrum of Procyon. Fundamental Parameters and Iron Abundance
Carlos Allende Prieto, Martin Asplund, Ramon J. Garcia Lopez +1
We have observed the spectrum of Procyon A (F5IV) from 4559 to 5780 A with a S/N of ~ 1e3 and a resolving power of 2e5. We have measured the line bisectors and relative line shifts…
Extinction calculations of multi-sphere polycrystalline graphitic clusters - A comparison with the 2175 AA peak and between a rigorous solution and discrete-dipole approximations
A. C. Andersen, J. A. Sotelo, V. N. Pustovit +1
Certain dust particles in space are expected to appear as clusters of individual grains. The morphology of these clusters could be fractal or compact. In this paper we study the li…
Chemical composition of red horizontal branch stars in the thick disk of the Galaxy
G. Tautvaisiene, B. Edvardsson, I. Tuominen +1
High-resolution spectra of 13 core helium-burning stars in the thick disk of the Galaxy have been obtained with the SOFIN spectrograph on the Nordic Optical Telescope to investigat…
Comments on alternative calculations of the broadening of spectral lines of neutral sodium by H-atom collisions
P. S. Barklem, B. J. O'Mara
With the exception of the sodium D-lines recent calculations of line broadening cross-sections for several multiplets of sodium by Leininger et al (2000) are in substantial disagre…
Chemical abundance patterns -- fingerprints of nucleosynthesis in the first stars
T. Karlsson, B. Gustafsson
The interstellar medium of low-metallicity systems undergoing star formation will show chemical abundance inhomogeneities due to supernova events enriching the medium on a local sc…
A model of spectral galaxy evolution including the effects of nebular emission
Erik Zackrisson, Nils Bergvall, Kjell Olofsson +1
This paper presents a new spectral evolutionary model of galaxies, properly taking the effects of nebular emission and pre-main sequence evolution into account. The impact of these…
The 'Forbidden' Abundance of Oxygen in the Sun
Carlos Allende Prieto, David L. Lambert, Martin Asplund
We reexamine closely the solar photospheric line at 6300 A, which is attributed to a forbidden line of neutral oxygen, and is widely used in analyses of other late-type stars. We u…
Dynamics of blue compact galaxies, as revealed by their H velocity fields II. Mass models and the starburst triggering mechanism
G. Ostlin, P. Amram, N. Bergvall +3
The H velocity fields of a sample of six luminous blue compact galaxies (BCGs) and two companions have been obtained by observations with a scanning Fabry-Perot interferometer.…
Search for Supernova Neutrino-Bursts with the AMANDA Detector
AMANDA collaboration
The core collapse of a massive star in the Milky Way will produce a neutrino burst, intense enough to be detected by existing underground detectors. The AMANDA neutrino telescope l…
Chemical Abundances from Inversions of Stellar Spectra: Analysis of Solar-Type Stars with Homogeneous and Static Model Atmospheres
Carlos Allende Prieto, Paul S. Barklem, Martin Asplund +1
Spectra of late-type stars are usually analyzed with static model atmospheres in local thermodynamic equilibrium (LTE) and a homogeneous plane-parallel or spherically symmetric geo…
Imaging of detached shells around the carbon stars R Scl and U Ant through scattered stellar light
D. Gonzalez Delgado, H. Olofsson, H. E. Schwarz +2
We present the first optical images of scattered light from large, detached gas/dust shells around two carbon stars, R Scl and U Ant, obtained in narrow band filters centred on the…
On OH line formation and oxygen abundances in metal-poor stars
M. Asplund, A. E. Garcia Perez
The formation of the UV OH spectral lines has been investigated for a range of stellar parameters in the light of 3D hydrodynamical model atmospheres. The low atmospheric temperatu…
QSO host galaxy star formation history from multicolour data
K. Jahnke, B. Kuhlbrodt, E. Orndahl +1
We investigate multicolour imaging data of a complete sample of low redshift (z<0.2) QSO host galaxies. The sample was imaged in four optical (BVRi) and three near-infrared bands (…
Abundance analyses of cool extreme helium stars
Gajendra Pandey, N. Kameswara Rao, David L. Lambert +2
Extreme helium stars (EHe) with effective temperatures from 8000K to 13000K are among the coolest EHe stars and overlap the hotter R CrB stars in effective temperature. The cool EH…