From the analysis of the 13-color photometry and spectroscopy of
HD 184279 (V 1294 Aql), we have found that for the last 10 years, this atar presents a pseudo period of 5.0 years both in light and radial velocity. There is a phase difference of 0.148 P (8.9 months) between the maximum of light and the minimum of radial velocity. The magnitude of the star changes by 0.4 mag. and the radial velocity shows a range ef 185 km/sec. A comparison with theoretical models give ua an Teff.<=28, 700 K with log.g<=4.0 in agreement with spectroscopic determinations.
The atar is reaching the maximum of light and some of their shell features are decreasing, a probable indication that the atar may return to a quiesent stage on its evolution, or it will continue the cyclic behaviour that has characterize it for the last 10 years. Its observation in UV and IR wavelenghts should be very important to measure the wind that may be present in the well developed shell surrounding the atar.
If G is a simple graph of size n without isolated vertices and G is its complement, we show that the domination numbers of G and G satisfy γ(G) + γ(G) ≤ { n − δ + 2 if γ(G) > 3, δ + 3 if γ(G) > 3, where δ is the minimum degree of vertices in G.
Research and development of interferometric systems for coordinate and multiaxis measuring are the goal of a common collaborative project involving the Institute of Scientific Instruments, Czech Academy of Sciences and Meopta - optika, s.r.o. The common effort is oriented to applications with the highest demands for precision in the dimensional metrology and nanometrology. The concept of the system represents a modular family of components configurable for various arrangements especially for coordinate measurements in nanotechnology and measurement of topography of surfaces. Meopta - optika, s.r.o. contributes to the project through development of new technology of production of optical components. We present here compact interferometric units designed for measurement by reflection from flat mirror. and Výzkum a vývoj interferometrických odměřovacích systémů pro souřadnicové a víceosé odměřování je náplní společného projektu, v němž spolupracují Ústav přístrojové techniky, Akademie věd České republiky, v.v.i. a podnik Meopta - optika, s.r.o. Společné snažení směřuje k aplikacím s nejvyššími nároky na přesnost v dimenzionální metrologii a nanometrologii. Zvolená koncepce systému představuje modulární rodinu komponent konfigurovatelnou pro různá uspořádání, zvláště pro víceosá měření v nanotechnologiích a měřeních topografie povrchů. Meopta - optika, s.r.o. přispívá především vývojem nové technologie výroby optických prvků rovinné optiky. Zde prezentujeme kompaktní interferometrické jednotky navržené pro interferometrické měření odrazem od rovinného zrcadla.