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105 papers · 1 filter
Discovery of non-radial pulsations in the spectroscopic binary Herbig Ae star RS Cha
T. Böhm, W. Zima, C. Catala +3
In this article we present a first discovery of non radial pulsations in both components of the Herbig Ae spectroscopic binary star RS Cha. The binary was monitored in quasi-contin…
Element enhancements along the entire AGB phase
E. C. Wylie-de Boer, P. L. Cottrell
The results of a study of the AGB phase of stellar evolution are presented. Abundances have been determined for Fe, C, O, the light s-process elements, Y and Zr, the heavy s-proces…
Solar Energetic Particle Spectrum on 13 December 2006 Determined by IceTop
R. Abbasi
On 13 December 2006 the IceTop air shower array at the South Pole detected a major solar particle event. By numerically simulating the response of the IceTop tanks, which are thick…
Microlensing Event MOA-2007-BLG-400: Exhuming the Buried Signature of a Cool, Jovian-Mass Planet
Subo Dong, I. A. Bond, A. Gould +55
We report the detection of the cool, Jovian-mass planet MOA-2007-BLG-400Lb. The planet was detected in a high-magnification microlensing event (with peak magnification A_max = 628)…
Search for Point Sources of High Energy Neutrinos with Final Data from AMANDA-II
The IceCube Collaboration
We present a search for point sources of high energy neutrinos using 3.8 years of data recorded by AMANDA-II during 2000-2006. After reconstructing muon tracks and applying selecti…
RoboNet-II: Follow-up observations of microlensing events with a robotic network of telescopes
Y. Tsapras, R. Street, K. Horne +20
RoboNet-II uses a global network of robotic telescopes to perform follow-up observations of microlensing events in the Galactic Bulge. The current network consists of three 2m tele…
The gamma Dor CoRoT target HD49434. I-Results from the ground-based campaign
K. Uytterhoeven, P. Mathias, E. Poretti +22
Context: We present the results of an extensive ground-based photometric and spectroscopic campaign on the gamma Dor CoRoT target HD49434. This campaign was preparatory to the CoRo…
A Low-Mass Planet with a Possible Sub-Stellar-Mass Host in Microlensing Event MOA-2007-BLG-192
D. P. Bennett, I. A. Bond, A. Udalski +44
We report the detection of an extrasolar planet of mass ratio q ~ 2 x 10^(-4) in microlensing event MOA-2007-BLG-192. The best fit microlensing model shows both the microlensing pa…
Inclination- and dust-corrected galaxy parameters: Bulge-to-disc ratios and size-luminosity relations
Alister W. Graham, C. C. Worley
While galactic bulges may contain no significant dust of their own, the dust within galaxy discs can strongly attenuate the light from their embedded bulges. Furthermore, such dust…
MOA-cam3: a wide-field mosaic CCD camera for a gravitational microlensing survey in New Zealand
T. Sako, T. Sekiguchi, M. Sasaki +16
We have developed a wide-field mosaic CCD camera, MOA-cam3, mounted at the prime focus of the Microlensing Observations in Astrophysics (MOA) 1.8-m telescope. The camera consists o…
OGLE-2005-BLG-071Lb, the Most Massive M-Dwarf Planetary Companion?
Subo Dong, Andrew Gould, Andrzej Udalski +81
We combine all available information to constrain the nature of OGLE-2005-BLG-071Lb, the second planet discovered by microlensing and the first in a high-magnification event. These…
Discovery of a Jupiter/Saturn Analog with Gravitational Microlensing
B. S. Gaudi, D. P. Bennett, A. Udalski +66
Searches for extrasolar planets have uncovered an astonishing diversity of planetary systems, yet the frequency of solar system analogs remains unknown. The gravitational microlens…
The interstellar medium towards the Ara OB1 region
Christopher D. Henderson, Barry Y. Welsh, John B. Hearnshaw
We present high resolution (R ~ 4 km/s) absorption measurements of the interstellar NaI and CaII lines measured towards 14 early-type stars of distance 123 pc - 1650 pc, located in…
s- and r-process element abundances in the CMD of 47 Tucanae using the Robert Stobie Spectrograph on SALT
C. C. Worley, P. L. Cottrell, E. C. Wylie de Boer
A recent study by Wylie et al 2006 has revealed that s-process element abundances are enhanced relative to iron in both red giant branch and asymptotic giant branch stars of 47 Tuc…
Dark energy without dark energy
David L. Wiltshire
An overview is presented of a recently proposed "radically conservative" solution to the problem of dark energy in cosmology. The proposal yields a model universe which appears to…
Inflation and Quintessence: Theoretical Approach of Cosmological Reconstruction
Ishwaree P. Neupane, Christoph Scherer
In the first part of this paper, we outline the construction of an inflationary cosmology in the framework where inflation is described by a universally evolving scalar field, with…
Search for Ultra High-Energy Neutrinos with AMANDA-II
The IceCube Collaboration, M. Ackermann
A search for diffuse neutrinos with energies in excess of 10^5 GeV is conducted with AMANDA-II data recorded between 2000 and 2002. Above 10^7 GeV, the Earth is essentially opaque…
Limits on additional planetary companions to OGLE-2005-BLG-390L
D. Kubas, A. Cassan, M. Dominik +1
We investigate constraints on additional planets orbiting the distant M-dwarf star OGLE-2005-BLG-390L, around which photometric microlensing data has revealed the existence of the…
Gravitational energy as dark energy: Concordance of cosmological tests
Ben M. Leith, S. C. Cindy Ng, David L. Wiltshire
We provide preliminary quantitative evidence that a new solution to averaging the observed inhomogeneous structure of matter in the universe [gr-qc/0702082, arxiv:0709.0732], may l…
Spectroscopy and multiband photometry of the afterglow of intermediate duration gamma-ray burst 040924 and its host galaxy
K. Wiersema, A. J. van der Horst, D. A. Kann +19
We present optical photometry and spectroscopy of the afterglow and host galaxy of gamma-ray burst 040924. This GRB had a rather short duration of T90 ~2.4s, and a well sampled opt…
Detection of Atmospheric Muon Neutrinos with the IceCube 9-String Detector
The IceCube Collaboration, A. Achterberg
The IceCube neutrino detector is a cubic kilometer TeV to PeV neutrino detector under construction at the geographic South Pole. The dominant population of neutrinos detected in Ic…
The Search for Muon Neutrinos from Northern Hemisphere Gamma-Ray Bursts with AMANDA
The IceCube Collaboration, A. Achterberg, the IPN Collaboration +2
We present the results of the analysis of neutrino observations by the Antarctic Muon and Neutrino Detector Array (AMANDA) correlated with photon observations of more than 400 gamm…
Multi-year search for a diffuse flux of muon neutrinos with AMANDA-II
IceCube Collaboration, A. Achterberg
A search for TeV - PeV muon neutrinos from unresolved sources was performed on AMANDA-II data collected between 2000 and 2003 with an equivalent livetime of 807 days. This diffuse…
The Munich Near-Infrared Cluster Survey (MUNICS) - IX. Galaxy Evolution to z ~ 2 From Optically Selected Catalogues
Georg Feulner, Yuliana Goranova, Ulrich Hopp +4
(Abridged) We present B, R, and I-band selected galaxy catalogues based on the Munich Near-Infrared Cluster Survey (MUNICS) which, together with the K-selected sample, serve as an…