Handling atmospheric dispersion and differential refraction effects in large-field multiobject spectroscopic observations

1998 ◽  
Author(s):  
Jean Gabriel Cuby ◽  
D. Bottini ◽  
Jean P. Picat
Keyword(s):  
Atmospheric Dispersion ◽  
Large Field ◽  
Spectroscopic Observations ◽  
Differential Refraction

scholarly journals Revisiting the impact of atmospheric dispersion and differential refraction on widefield multiobject spectroscopic observations

2014 ◽  
Vol 566 ◽  
pp. A2 ◽  
Author(s):  
R. Sánchez-Janssen ◽  
S. Mieske ◽  
F. Selman ◽  
P. Bristow ◽  
P. Hammersley ◽  
...  
Keyword(s):  
Atmospheric Dispersion ◽  
Spectroscopic Observations ◽  
The Impact ◽  
Differential Refraction

scholarly journals Atmospheric Transport Modeling with 3D Lagrangian Dispersion Codes Compared with SF6 Tracer Experiments at Regional Scale

2007 ◽  
Vol 2007 ◽  
pp. 1-13 ◽  
Author(s):  
François Van Dorpe ◽  
Bertrand Iooss ◽  
Vladimir Semenov ◽  
Olga Sorokovikova ◽  
Alexey Fokin ◽  
...  
Keyword(s):  
Nuclear Power ◽  
Atmospheric Transport ◽  
Regional Scale ◽  
Atmospheric Dispersion ◽  
Large Field ◽  
Dispersion Modeling ◽  
Order Of Magnitude ◽  
Lagrangian Dispersion ◽  
Atmospheric Transport Modeling ◽  
Tracer Experiments

The results of four gas tracer experiments of atmospheric dispersion on a regional scale are used for the benchmarking of two atmospheric dispersion modeling codes, MINERVE-SPRAY (CEA), and NOSTRADAMUS (IBRAE). The main topic of this comparison is to estimate the Lagrangian code capability to predict the radionuclide atmospheric transfer on a large field, in the case of risk assessment of nuclear power plant for example. For the four experiments, the results of calculations show a rather good agreement between the two codes, and the order of magnitude of the concentrations measured on the soil is predicted. Simulation is best for sampling points located ten kilometers from the source, while we note a divergence for more distant points results (difference in concentrations by a factor 2 to 5). This divergence may be explained by the fact that, for these four experiments, only one weather station (near the point source) was used on a field of 10 000 km2, generating the simulation of a uniform wind field throughout the calculation domain.

Spectroscopic Observations of Visual Double Stars

1965 ◽  
Vol 5 ◽  
pp. 109-111
Author(s):  
Frederick R. West
Keyword(s):  
Radial Velocity ◽  
High Dispersion ◽  
Velocity Difference ◽  
Spectrograph Slit ◽  
Spectroscopic Observations ◽  
Double Stars ◽  
Visual Double Stars ◽  
Relative Orbit ◽  
Two Component ◽  
Star Images

There are certain visual double stars which, when close to a node of their relative orbit, should have enough radial velocity difference (10-20 km/s) that the spectra of the two component stars will appear resolved on high-dispersion spectrograms (5 Å/mm or less) obtainable by use of modern coudé and solar spectrographs on bright stars. Both star images are then recorded simultaneously on the spectrograph slit, so that two stellar components will appear on each spectrogram.

Models of Cataclysmic Variables from Photometric and Spectroscopic Data

1979 ◽  
Vol 46 ◽  
pp. 65-74 ◽  
Author(s):  
A.C. Fabian ◽  
J.E. Pringle ◽  
J.A.J. Whelan ◽  
J.A. Bailey
Keyword(s):  
Spectroscopic Data ◽  
Cataclysmic Variables ◽  
System Parameters ◽  
Dwarf Nova ◽  
Spectroscopic Observations ◽  
Photometric And Spectroscopic Observations

Abstract.Recent photometric and spectroscopic observations of the dwarf nova system Z Cha are discussed. Methods for constraining the system parameters are applied and the disc emissivity is deduced as a function of radius. Indications are found that the disc shrinks in size with increasing time after outburst.

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