Imaging simulations of selected science with the Magdalena Ridge Observatory Interferometer

We present simulated observations of surface features on Red Supergiant (RSG) stars and clumpy dust structures surrounding Active Galactic Nuclei (AGN) with the Magdalena Ridge Observatory Interferometer (MROI). These represent two of the classes of astrophysical targets enumerated in the MROI Key Science Mission that are typical of the types of complex astrophysical phenomena that the MROI has been designed to image. The simulations are based on source structures derived from recent theoretical models and include both random and systematic noise on the measured Fourier data (visibility amplitudes and closure phases) consistent with our expectations for typical such targets observed with the MROI. Image reconstructions, obtained using the BSMEM imaging package, are presented for 4-, 6- and 8- telescope implementations of the array. Although a rudimentary imaging capability is demonstrated with only 4 telescopes, the detailed features of targets are only reliably determined when at least 6 telescopes are present. By the tine 8 telescope are used, the reconstructed images are sufficiently faithful to allow the discrimination between competing models, confirming the design goal of the MROI, i.e. to offer model-independent near-infrared imaging on sub-milliarcsecond scales

Milli-arcsecond astrophysics with VSI, the VLTI spectro-imager in the ELT era

Nowadays, compact sources like surfaces of nearby stars, circumstellar environments of stars from early stages to the most evolved ones and surroundings of active galactic nuclei can be investigated at milli-arcsecond scales only with the VLT in its interferometric mode. We propose a spectro-imager, named VSI (VLTI spectro-imager), which is capable to probe these sources both over spatial and spectral scales in the near-infrared domain. This instrument will provide information complementary to what is obtained at the same time with ALMA at different wavelengths and the extreme large telescopes.Comment: 8 pages. To be published in the proceedings of the ESO workshop "Science with the VLT in the ELT Era", held in Garching (Germany) on 8-12 October 2007, A. Moorwood edito

Atmospheric dynamics of red supergiant stars

MONTPELLIER-BU Sciences (341722106) / SudocSudocFranceF

Etude des rayons cosmiques d'ultra-haute énergie avec l'observatoire Pierre-Auger (vers l'observation d'anisotropies dans les directions d'arrivées ?)

PARIS7-Bibliothèque centrale (751132105) / SudocSudocFranceF

Photocentric and photometric variability of Red Supergiant stars

0info:eu-repo/semantics/nonPublishe

Line formation in 3D radiation hydrodynamics simulations of red supergiants

info:eu-repo/semantics/publishe

Radiative transfer in snapshots of 3D radiative hydrodynamic models of red supergiants

info:eu-repo/semantics/publishe

Interferometric Constraints on Surface Brightness Asymmetries in Long-Period Variable Stars. A Threat to Accurate Gaia Parallaxes

0info:eu-repo/semantics/nonPublishe

The 90-110 mumum dust feature in low to intermediate mass protostars: Calcite?

info:eu-repo/semantics/publishe