... Her X­1 is one the first X­ray binary pulsar discovered by the eminent UHURU satellite in 1972 (Tananbaum et al. 1972, Giacconi et al. 1973) and since then remains one of the most studied accretion­driven X­ray stellar bi­ naries. ... 1972). The amplitude of the reflection effect strongly increases in ultraviolet and according to many optical UBV­photometrical data is \Deltam V = 1:45; \Deltam B = 1:6; \Deltam U = 2:55. ... 1982), HEAO­1 (Gorecki et al. ... 1984, Ohashi et al. ...

... Subject of Astronomy. ... Basis of Spherical and Practical Astronomy. ... Celestial Sphere. ... Changes of Star's Coordinates as a Result of Daily Rotation of Celestial Sphere. ... Time Measuring. ... Changes of Solar Equatorial Coordinates. ... Stellar Day, Stellar Time. ... Real Solar Time. ... Mean Solar Time. ... Connections between Stellar and Mean Time. ... Apparent Path and Configuration of Planets. ... Ways of Energy Transportation to Stellar Surface.Basis of Spectral Analysis. ... Solar...

HST Call for Proposals and HST Primer for Cycle 24 . ... Hubble Space Telescope Primer for Cycle 24 > Chapter 5: Observing Considerations > 5.3 Solar System Targets . ... Solar System Targets . Objects within the Solar System move with respect to the fixed stars. ... This is accomplished by maintaining FGS Fine Lock on guide stars, and driving the FGS star sensors in the appropriate path, thus moving the telescope to track the target. ...

... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . ... We present multi-wavelength observations of the helium-dominated accreting binary KL Dra which has an orbital period of 25 mins. ... Although KL Dra is a weak X-ray source we find no significant evidence that the X-ray flux varies over the course of an outburst cycle. We can reproduce the main features of the 60 day outburst cycle using the Disc Instability Model and a helium-dominated accretion flow. ...

Text of these problems is available also in other languages : . ... What can one see in the Moon's sky more often - the Sun or the Earth? ... There are about of 250 millions of stars in the elliptical galaxy M32 (a satellite of Andromeda galaxy). ... The masses of Capella's components. ... You are proposed to estimate the masses of Capella's components, using our observational data. ... A galaxy's mass. ... Estimate the mass of FGC 1908 and compare it to the mass of our galaxy. ...

... He considers some practical aspects of dependences of the optical properties of cosmic dust analogs on their parameters. ... First results of a systemtic study as well as a detailed comparison of different optical characteristics (cross-sections, phase function, etc.) of some complex shape and structure scatterers and their optical models are presented here and here . ...

Teaching courses . for student of the Department of Astrophysics and Stellar Astronomy . ... Geophysics and physics of the planets (Kurt, Panteleev) . ... Close Binary Stars . ... Solar Physics . ... This is introductory course for students of the third year of education which are familiar with elementary astronomy and general physics. ... The one-year course includes theory of radiation transfer, theory of internal stellar structure with account of binary systems with compact comapnions. ...

RADIO AND OPTICAL OBSERVATIONS OF THE PSR B1259-63/SS 2883 Be STAR BINARY SYSTEM . Simon Johnston (ATNF, CSIRO, and RCfTA, University of Sydney, Australia), . ... Abstract We report here on radio timing observations of the 47-ms pulsar PSR B1259-63 (PSR J1302-6350) and optical observations of its binary companion Be star, SS 2883. ... The system is a likely progenitor of the high-mass X-ray binaries and double-neutron-star systems such as PSR B1913+16. simonj@physics.usyd.edu.au ...