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- Centre National de la Recherche ScientifiqueFR321 papers
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12 papers · 2 filters
Location of Weak CSS Sources on the Evolutionary Path of Radio-loud AGN
Andrzej Marecki, Ralph E. Spencer, Magdalena Kunert
According to the currently accepted paradigm compact steep spectrum (CSS) sources are precursors of larger/older objects and gigahertz peaked spectrum (GPS) sources may be earlier…
Weak CSS Sources from FIRST Survey
Andrzej Marecki, Jacek Niezgoda, Jacek Wlodarczak +3
We report early results of an observational campaign targeted on a sample of compact steep spectrum sources selected from the FIRST survey which are significantly weaker than those…
Constraints on dark energy and quintessence with a comoving standard ruler applied to 2dF quasars
Gary A. Mamon, Boud F. Roukema
Structures on very large scales (> 100 Mpc) have negligible peculiar motions, and are thus roughly fixed in comoving space. We looked for significant peaks at very large separation…
Peculiar outburst of the newly revealed variable star V838 Mon
D. Kolev, M. Mikolajewski, T. Tomov +4
We present photometric and high- and low-resolution spectroscopic observations of the unusual outburst of V838 Mon. The data were collected at the NAO Rozhen, Bulgaria and at the T…
High-velocity regions in planetary nebulae
Krzysztof Gesicki, Albert A. Zijlstra
The internal velocity fields of planetary nebulae are studied with a resolution of 5 km s. We analyze deep echelle spectra from three nebulae in the Bulge, the Sagittarius D…
HP Lyr - possibly the hottest RV Tau type object
Dariusz Graczyk, Maciej Mikolajewski, Laurits Leedjarv +4
We report Johnson's UBVRI photometric and optical spectroscopic observations of a long period variable HP Lyr which up to now has been considered an eclipsing binary with a period…