Search Publications
Multi-correlation analyses of TOF-SIMS spectra for mineralogical studies
Thomas, R.; Engrand, C.; Martin, P. +2 more
A time-of-flight mass spectrometer (TOF-SIMS, COSIMA experiment) has been launched by ESA the 2nd March 2004, on board the comet bound spacecraft "ROSETTA". The scientific objectives of COSIMA are the determination of the compositions of cometary grains as well as the molecular analyses of their exposed organic compounds. These analyses will provi…
Absolute Accuracy and Repeatability of the Rmib Radiometers for Tsi Measurements
Mekaoui, Sabri; Dewitte, Steven; Conscience, Christian +3 more
Radiometers for the measurement of the total solar irradiance from space have been developed by D. Crommelynck at the Royal Meteorological Institute of Belgium (RMIB) since 1970. These radiometers, also used in the set of instruments defining the "World Radiometric Reference", have successively flown on SPACELAB 1, ATLAS 1, EURECA, ATLAS 2, ATLAS …
1WGA J2223.7-0206: A Narrow-Line Quasi-Stellar Object in the XMM-Newton field of view of 3C 445
Palazzi, E.; Masetti, N.; Grandi, P. +1 more
We report the discovery of a Narrow Line QSO located at about 1.3' from the Broad Line Radio Galaxy 3C 445. The source, 1WGA J2223.7-0206, although already revealed by ROSAT, has never been optically identified previously. An XMM-Newton observation of 3C 445 has allowed, for the first time, an accurate X-ray spectral study of 1WGA J2223.7-0206, re…
Instantaneous local wave vector estimation from multi-spacecraft measurements using few spatial points
Buckley, A.; Carozzi, T.; Gough, M.
Available from http://www.copernicus.org/site/EGU/annales/22/7/2633.htm?FrameEngine=false;
Absolute Calibration of the PL-Relations for the Classical Cepheids Based on the HIPPARCOS Parallaxes and the Distances of the Magellanic Clouds
Abrahamyan, H. V.
The zero points of the period-luminosity relations for the classical cepheids are calibrated based on the HIPPARCOS parallaxes of these stars. The calibrations are used to determine the distance moduli of the LMC and SMC: DMLMC = 18m.569 ± 0m.117 and DMSMC = 19m.070 ± 0m.119, respec…
Photometric analysis of EL Aqr
Wadhwa, Surjit S.; Zealey, William J.
We present an analysis of the Hipparcos and ASAS photometry of the W UMa star EL Aqr. The Wilson-Devinney code is employed in conjunction with recent spectroscopic mass ratio of 0.203 to model the V band light curve. We confirm that the system is an A type contact binary however our analysis suggests that it is over massive for its spectral class …
Space Weather Effects on Technology
Valtonen, Eino
Space weather effects on technology are discussed. After a brief general overview of the consequences of space weather on various technologies and a summary of the space environment, the effects of plasmas and particle radiation on systems in space are considered in more detail. The processes responsible for spacecraft surface charging and interna…
Observational studies of Cataclysmic Variable evolution: Of samples, biases and surprises
Gänsicke, B. T.
I present brief status reports on three large observational projects that are designed to test our current understanding of the evolution of cataclysmic variables (CVs): The spectroscopic selection of new CVs in the Hamburg Quasar Survey, the search for pre-CVs based on Sloan colours and UK Schmidt/6dF multiobject spectroscopy, and the identificat…
High-resolution spectroscopy of flat-spectrum quasars. I. Redshifted emission and absorption in PKS 2145+067
Black, J. H.; Tappe, A.
We report Very Large Telescope (VLT) observations of the quasar
High-resolution near-infrared speckle interferometry and radiative transfer modeling of the OH/IR star OH 104.9+2.4
Weigelt, G.; Hofmann, K. -H.; Men'shchikov, A. B. +3 more
We present near-infrared speckle interferometry of the OH/IR star