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Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
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23 papers · 2 filters
Search for extraterrestrial point sources of high energy neutrinos with AMANDA-II using data collected in 2000-2002
The AMANDA Collaboration, M. Ackermann
The results of a search for point sources of high energy neutrinos in the northern hemisphere using data collected by AMANDA-II in the years 2000, 2001 and 2002 are presented. In p…
The starburst phenomenon from the optical/near-IR perspective
Nils Bergvall, Thomas Marquart, Göran Östlin +1
The optical/near-IR stellar continuum carries unique information about the stellar population in a galaxy, its mass function and star-formation history. Star-forming regions displa…
Interpretations of gamma-ray burst spectroscopy. II. Bright BATSE bursts
Felix Ryde, Dan Kocevski, Zsolt Bagoly +2
We analyze the spectral lags of a sample of bright gamma-ray burst pulses observed by CGRO BATSE and compare these with the results of high-resolution spectroscopical investigation…
The Zeeman-sensitive emission lines of Mg I at 12 micron in Procyon
Nils Ryde, Andreas Korn, Matthew Richter +1
Emission-lines of magnesium at 12 microns have been observed in the spectrum of Procyon. We reproduce the observed, disk-averaged line flux from Procyon (as well as the observed in…
Fine structure of the chromospheric activity in Solar-type stars - The Halpha Line
W. Lyra, G. F. Porto de Mello
A calibration of H-alpha as both a chromospheric diagnostic and an age indicator is presented, complementing the works previously done on this subject (Herbig 1985, Pasquini & Pall…
New results from the Antarctic Muon And Neutrino Detector Array
Kurt Woschnagg
We present recent results from the Antarctic Muon And Neutrino Detector Array (AMANDA) on searches for high-energy neutrinos of extraterrestrial origin. We have searched for a diff…
The Hamburg/ESO R-process Enhanced Star survey (HERES). I. Project description, and discovery of two stars with strong enhancements of neutron-capture elements
N. Christlieb, T. C. Beers, P. S. Barklem +15
We report on a dedicated effort to identify and study metal-poor stars strongly enhanced in r-process elements ([r/Fe] > 1 dex; hereafter r-II stars), the Hamburg/ESO R-process Enh…
Efficient Searches for r-Process-Enhanced, Metal-Poor Stars
T. C. Beers, P. S. Barklem, N. Christlieb +1
Neutron-capture-enhanced, metal-poor stars are of central importance to developing an understanding of the operation of the r-process in the early Galaxy, thought to be responsible…
The Abundance of Elements in Cool Stars, as Determined from High-Resolution, 1-5 Micron Spectroscopy
N. Ryde, B. Gustafsson, K. Eriksson +1
We review the field of abundance determinations of elements in cool stars, with special interest paid to determinations based on analyses of high-resolution, 1-5 micron spectra. We…
Subgiants as probes of galactic chemical evolution
Patrik Thoren, Bengt Edvardsson, Bengt Gustafsson
Chemical abundances for 23 candidate subgiant stars have been derived with the aim at exploring their usefulness for studies of galactic chemical evolution. High-resolution spectra…
Muon Track Reconstruction and Data Selection Techniques in AMANDA
The AMANDA Collaboration, J. Ahrens
The Antarctic Muon And Neutrino Detector Array (AMANDA) is a high-energy neutrino telescope operating at the geographic South Pole. It is a lattice of photo-multiplier tubes buried…
Non-thermal Mg I emission at 12 um from Procyon
N. Ryde, M. J. Richter
We report on stellar Mg I emission at 12 um from alpha CMi (Procyon), a star slightly hotter than the Sun. Solar Mg I emission is well-known and its formation was successfully expl…
Interpolation of Stellar Model Grids and Application to the NEMO Grid
J. Nendwich, U. Heiter, F. Kupka +2
NEMO.2003 (vienna NEw MOdel grid of stellar atmospheres) is a DVD with 91,520 stellar model atmospheres representing a 5D grid of modified ATLAS9 atmospheres; the purpose of the mo…
Abundances In Very Metal Poor Dwarf Stars
Judith G. Cohen, Norbert Christlieb, Andrew McWilliam +7
We discuss the detailed composition of 28 extremely metal-poor dwarfs, 22 of which are from the Hamburg/ESO Survey, based on Keck Echelle spectra. Our sample has a median [Fe/H] of…
Search for Neutrino-Induced Cascades with AMANDA
the AMANDA Collaboration, M. Ackermann
We report on a search for electro-magnetic and/or hadronic showers (cascades) induced by high energy neutrinos in the data collected with the AMANDA II detector during the year 200…
Stellar dynamics of blue compact galaxies: I. Decoupled star-gas kinematics in ESO 400-G43
G. Ostlin, R. J. Cumming, P. Amram +5
In this letter we present the first results from a program aimed at measuring the stellar kinematics of blue compact galaxies by observing the near-infrared Calcium triplet. We sho…
Dynamic model atmospheres of cool giants
S. Hoefner, R. Gautschy-Loidl, B. Aringer +3
Cool giant stars are highly dynamical objects, and complex micro-physical processes play an important role in their extended atmospheres and winds. The interpretation of observatio…
S4N: A Spectroscopic Survey of Stars in the Solar Neighborhood
Carlos Allende Prieto, Paul S. Barklem, David L. Lambert +1
[ABRIDGED] We report the results of a high-resolution spectroscopic survey of all the stars more luminous than Mv = 6.5 mag within 14.5 pc from the Sun. We derive stellar parameter…
Collisional depolarization and transfer rates of spectral lines by atomic hydrogen. IV: application to ionised atoms
M. Derouich, S. Sahal-Bréchot, P. S. Barklem
The semi-classical theory of collisional depolarization of spectral lines of neutral atoms by atomic hydrogen (Derouich et al. 2003a; Derouich et al. 2003b; Derouich et al. 2004 an…
On the oxygen abundance of HE0107-5240
M. S. Bessell, N. Christlieb, B. Gustafsson
We have determined the oxygen abundance of HE0107-5240 from UV-OH lines detected in VLT/UVES spectra. Using a plane-parallel LTE model atmosphere, we derive [O/Fe] = +2.4, and a si…
WIMP diffusion in the solar system including solar depletion and its effect on Earth capture rates
Johan Lundberg, Joakim Edsjo
Weakly Interacting Massive Particles (WIMPs) can be captured by the Earth, where they eventually sink to the core, annihilate and produce e.g. neutrinos that can be searched for wi…
Multi-Site observations of SU Aurigae
Y. C. Unruh, J. -F. Donati, J. M. Oliveira +20
We present results from the 1996 MUSICOS (MUlti-SIte COntinuous Spectroscopy) campaign on the T Tauri star SU Aurigae. We find a 2.7-d periodicity in the He I (587.6 nm) line and s…
No magnetic field variation with pulsation phase in the roAp star gamma Equulei
O. Kochukhov, T. Ryabchikova, N. Piskunov
We present an analysis of 210 high-resolution time-resolved spectropolarimetric observations of the roAp star gamma Equ obtained over three nights in August and September 2003. Rad…