Search Publications
The First Cluster and Double Star Symposium
Laakso, Harri; Goldstein, Melvyn; Masson, Arnaud +2 more
Cluster, a joint project between the European Space Agency (ESA) and NASA, is the first mission that is composed of four spacecraft flying in formation, and thus the first able to separate spatial and temporal features inside smallscale plasma structures within, and the boundaries between, many regions of the Earth's upper atmosphere (from 19,000-…
Graphical method for estimation of accuracy of astrometric catalogues
Nefedjev, Yu. A.; Rizvanov, N. G.; Rakhimov, L. I. +1 more
We propose a new method for the estimation of the accuracy of star positions and proper motions in astrometric catalogues based on the comparison of the star positions in catalogue a under investigation and the HIPPARCOS catalogue in various epochs but for a standard equinox. In this case the comparison results are represented as a curve. On the a…
On the concepts of a highly integrated payload suite for use in future planetary missions: The example of the BepiColombo Mercury planetary orbiter
Schulz, R.; Erd, C.; Buis, E. J. +6 more
Future low resource payload concepts will need to be developed from the viewpoint of a standard integrated payload suite where resources are dramatically reduced through high levels of integration and resource sharing. The study of this approach, its gains together with its limitations was the key objective of this work. The highly compact integra…
Understanding the relativistic accretion disk of GRS 1915 + 105
Belloni, Tomaso; Matt, Giorgio; Karas, Vladimír +2 more
We discuss the evidence for GRS 1915 + 105 hosting an optically thick, relativistic accretion disk (at least in some spectral phases). We give particular emphasis to the iron line phenomenology.
Detailed analyses of GRB 060105 X-ray afterglow observed by Suzaku
Yonetoku, D.; Yamauchi, M.; Yamaoka, K. +35 more
Turbulence and Ion Acceleration in the Outer Heliosphere
Wurz, Peter; Kallenbach, Reinald; Hilchenbach, Martin +1 more
The transport parameters of suprathermal and energetic particles in the heliosphere are intimately linked to the properties of the plasma turbulence in the supersonic solar wind flow and in the subsonic heliosheath plasma flow beyond the termination shock. Based on observations with the magnetometers on board the Helios, ACE, Ulysses, and Voyager …
Pulsating B Stars Discovered by HIPPARCOS
Poretti, E.; Musazzi, F.
The photometric properties of the variable stars located in the lower part of the classical instability strip are discussed. The importance of the determination of some light curve parameters and their connection with the stellar models are stressed, with a particular emphasis on large amplitude Delta Scuti stars.
A dichotomy in radio jet orientations
de Zeeuw, P. T.; Verdoes Kleijn, Gijs
We examine the relative orientations of radio jets, central dust and stars in low-power (i.e., FR I and FR I/II) radio galaxies. We use the position angles of jet and dust to constrain the three-dimensional angle θDJ between jet and dust. For galaxies with filamentary dust 'lanes' (which tend to be misaligned with the galaxy major axis)…
Autocorrelation and Fourier analysis of the Crimean and Hipparcos photometry of the runaway star HD 192281
Barannikov, A. A.
New B sbnd V sbnd R photoelectric photometry of the runaway star HD 192281 combined with Hipparcos observations of this star show a periodic brightness variation with a period of 67.385 days.
Background radiation effects and hazards in planetary instrumentation
Butcher, Gillian; Sims, Mark R.; Fraser, George +3 more
Recent and proposed future planetary missions are becoming increasingly concerned with detailed geochemical assessment, often in a bid to ascertain the presence of water and life supporting geochemical systems. The instruments involved may use some kind of radioactive source, e.g. X-ray fluorescence spectrometry, Mössbauer spectrometry, neutron sc…