Search Publications
Missions
Journals
Publication Years
Distribution of positron annihilation radiation
Milne, Peter A.
The SPI instrument on-board the ESA/INTEGRAL satellite is engaged in a mission-long study of positron annihilation radiation from the Galaxy. Early results suggest that the disk component is only weakly detected at 511 keV by SPI. We review CGRO/OSSE, TGRS and SMM studies of 511 keV line and positronium continuum emission from the Galaxy in light …
Light bending models in AGNs
Miniutti, G.
We review the MCG-6-30-15 observations and results that provided the motivation for the light bending model. We present a summary of the main properties of the model and discuss its application to MCG-6-30-15 briefly mentioning other X-ray sources showing the same qualitative behaviour. Finally, we report on one of the most spectacular cases so fa…
Coupling effects throughout the solar atmosphere: 2. Model of energetically open circuit
Ryutova, M.
EUV structures in the solar atmosphere are studied on the basis of the energetically open equivalent circuits. The systems consist of current carrying magnetic loops that interconnect a high β energy-production region with a low β dissipation region and include the transition region where the most efficient generation of currents and transport of …
Calibration of the PRONAOS/SPM submillimeter photometer
Bernard, J. -P.; Dupac, X.; Giard, M. +12 more
Context: .
Aims: .PRONAOS is a stratospheric balloon-borne project dedicated to submillimeter astronomy. Sensitive to low emission gradients, PRONAOS allowed pointed observations in four photometric bands between 200 µm and 1.2 mm with an angular resolution of 2' to 3.5'. We present here the PRONAOS calibration strategy and the accuracy …
Multidimensional physicochemical models of the near-nucleus coma: Present achievements and requested future developments
Crifo, J. -F.
The published multidimensional physicochemical simulations of the near-nucleus coma (hereafter "NNC") are reviewed. The goals of these simulations are to understand the physical origin of the observed NNC structure(s), and to relate the latter to properties of the nucleus - an inference which is often done on the basis of subjective impressions on…
Multi-aperture photometry of extended IR sources with ISOPHOT. I. The nature of extended IR emission of planetary Nebulae
Walker, H. J.; Richards, P. J.; Müller, T. G. +2 more
Context: .ISOPHOT multi-aperture photometry is an efficient method to resolve compact sources or to detect extended emission down to relatively faint levels with single detectors in the wavelength range 3 to 100 µm.
Aims: .Using ISOPHOT multi-aperture photometry and complementary ISO spectra and IR spectral energy distributions we discus…
On Deriving Plasma Velocity Information from CDS/NIS Observations: Application to the Dynamics of Blinkers
Brooks, David Hamilton; Bewsher, Danielle
Using standard instrument software and two independently developed data reduction and analysis procedures, we re-examine the accuracy of plasma velocity information derived from data obtained by the Solar and Heliospheric Observatory (SOHO)-Coronal Diagnostic Spectrometer (CDS). We discuss only the Ov 629 Å line data obtained by the Normal Inciden…
Astrometric study of the triple star ADS 9173
Kiyaeva, O. V.
An approximate orbit of the wide visual binary star ADS 9173 A(Bb) with a period of ∼6000 yr has been determined for the first time by the method of apparent motion parameters. The orbit was computed using a short (1982 2004) arc of photographic observations obtained with the 26-inch Pulkovo Observatory refractor and the Hipparcos parallax. Agreem…
An archival study of extended X-ray emission from classical and recurrent novae
Balman, Şölen
I discuss morphology and spectrum of the first resolved and detected classical nova shell in the X-rays - the remnant of GK Persei (1901). The existence of such a nebulosity brings about the possibility of other nova remnants emitting X-rays. I calculate that the X-ray luminosity should be about 10 26-10 33 ergs s -1
The separation of red horizontal branch giants from reduced proper motions
Rybka, S. P.
The possibility to use reduced proper motions for distinguishing red horizontal branch giants from foreground stars is substantiated. Our approach is developed on the basis of HIPPARCOS astrometric data and near-infrared 2MASS photometric data taken from the UCAC2 BSS catalogue. The application of maximum-likelihood technique to analyse the distri…