... We present a computer program for modelling energy flux distribution and light curves of eclipsing binaries from far ultraviolet to infrared regions. The Roche model is assumed. Proximity effects of components (reflection of radiation and surface gravity darkening) are taken into account. ... Figure 1: The surface temperature distribution for Algol A-B system before (upper plot) and after (lower plot) correction for temperature due to the irradiation effect. ...

A Canadian and American team of Astronomers have used the 305-m wide Arecibo radio dish, the world's largest and most sensitive radio telescope, to uncover a dozen new super-fast-spinning pulsars. The team directed their search for these rare and exotic stars by pointing the Arecibo radio telescope towards massive star clusters, called Globular Clusters, orbiting our Milky Way galaxy. ... One of the most exotic residents in the Globular cluster system are the millisecond pulsars. ...

... We have simulated the observations of a very distant cluster of galaxies at high redshift. ... The simulations are made for the HST instruments FOC, WFPC II, and the Advanced Camera, and for an 8-m telescope on the ground equipped with adaptive optics. ... A comparison of the fields of view of post-COSTAR HST imaging instruments with the Advanced Camera (AC) and the ground-based adaptive optics camera (AO) is shown in Fig. 1 superimposed on the noise-free cluster simulation. ...

... 7.07.2001 . ... Outward bound, this primordial piece of the solar system is still just visible to the unaided eye and can now be sighted by northern hemisphere skygazers as it moves through the constellation Pisces. ... Just as rainbows are lit by the Sun, moonbows are lit by the Moon. ... Pictured above is a moonbow stretching over Salt Pond Bay in St. Unusual Flashes Toward Globular Cluster M22 . ... This teaming ball of stars is the brightest globular cluster visible in Earth's northern...

... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . ... A sample of our new eclipse observations phased on our new ephemeris (section 4.2) Vertical grey bars indicate ingress and egress of the main accretion spot. ... When combined with published eclipse times and archival data spanning тИ®27 years, we detect departures from a linear and quadratic trend of тИ®60 s. The departures are strongly suggestive of two cyclic variations of 16(3) and 5.25(25) years. ...

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... Searching for Far Out and Wandering Worlds . ... The Real Reality Show: Would aliens be anything like us? ... The SETI Institute is after alien signals. Assuming another world is beaming a 1-million-watt radio signal in our direction, how far away can that source be before the signal is lost in intergalactic noise? ... Get instant access to subscriber content on Astronomy.com! ... If you are already registered on Astronomy.com, please log in below. ...

... Science User Portal . ... ESO, the European Southern Observatory . ... Travel and Contacts . Travel to ESO Headquarters . ... Travel to E-ELT Armazones . ... Survey Telescopes . ... Star Clusters . ... Stars@ESO . ... ESO Science Newsletter . ... ESO 3.6-metre telescope . ... MPG/ESO 2.2-metre telescope . ... ESO 1-metre Schmidt telescope . ... Solar Eclipse at ESO HQ - 11.08.1999 . ... ESO Science Outreach Network . ... This video shows an artistтАЩs impression of an eclipsing binary star system. ...

Next: Disk Expansion and Up: The Epsilon Aurigae Previous: Vertical Structure of . ... We model disks with and without central holes and use a variety of midplane opacities and temperatures. ... The eclipse lightcurve was computed on a grid of 505 time steps separated by approximately 1.3 days, for a range of values of the disk scale height, , the inclination, i , and central hole radius, . The opacity parameter, approximately equal to the ``vertical'' optical depth of the disk, is: . ...

Stellar Clusters are very useful laboratories for empirically studying stellar evolution. ... All cluster stars are at the same distance . All cluster stars have the same physical age . ... CM diagram Young Cluster In this case we see the Main Sequence fully represented. The blue dots represent massive stars with short main sequence lifetimes. ... Thus, identifying the most massive star which is still on the main sequence is an effective means of determining the age of a stellar cluster. ...

The Beginning of Cosmology Development of General Relativity -1907 · In 1907 (2 years after Special Relativity publication, Einstein asked himself the question ­ how does Newtonian Gravity work to fit in with special relativity? ... Also realised that there should be gravitational redshift 1912 · Einstein proved that special relativity's Lorentz Transformations were invalid if Equivalence Principal held · And that he could not make the equivalence principal hold locally, unless.. ...

Hipparchus (and possibly Aristarchus before him) also derived the Moon's distance from the duration of a lunar eclipse . Because the Earth casts a much larger shadow than the Moon, such an eclipse usually darkens the entire Moon, for several hours. ... If the Sun is assumed to be very distant, and if the Moon crosses the middle of the shadow (if not, corrections must be made), the width of the shadow is expected to be about 2r , twice the Earth's radius r . ... Last updated 4 February 1999 Moon. ...

... We address a question if globular clusters (GC) in a protogalaxy could for some time evolve chemically as isolated systems, enriching themselves with heavy elements produced in first supernova events that follow initial star formation. We determine both the critical mass of a protoglobular cluster that is needed to retain the ejecta of the very first supernova, and the critical energy (i.e., number of supernovae) that is needed to expel the residual gas from a cluster of a given mass. ...

... Proximity e#ects of com­ ponents (reflection of radiation and surface gravity darkening) are taken into account. ... As an example, we consider the Algol (# Persei) system, where an eclipsing pair (Algol A­B) is accompanied by the third component (Algol C). ... The surface temperature distribution for Algol A­B system before (upper plot) and after (lower plot) correction for temperature due to the irradiation e#ect. ... We solve this equation by the iterative Newton­Raphson method. ...

... MAO main . ... The DRAGON globular cluster simulations: a million stars, black holes and gravitational waves . ... simulations of globular clusters with a million stars on the high-performance . ... of stars in globular clusters at unprecedented detail but also shed light into . the dark world of black holes. ... clusters of single and binary black holes. ... of a globular cluster. www.mpa-garching.mpg.de/328833/hl201603 . ... MAO/NASU, 27 Akademika Zabolotnoho St. 03680 Kyiv, Ukraine . ...

... The discovery of this radiopulsar is potentially important not only for confirming the theory of evolution of NS, but also for understanding processes occurring in stellar winds   from normal stars. After all, a radiopulsar orbiting in the semi-transparent stellar wind of a normal star is a sort of probe scanning an inhomogeneous plasma by pulsed radiation (Lipunov and Prokhorov, 1984)[ 110 ]. ... 1) absorption of radio waves (light curve); . ... This object is a radiopulsar orbiting a Be-star. ...

Blueshifted galaxies in the Virgo cluster I. D. Karachentsev, O. G. Nasonova (Kashibadze), Special Astrophysical Observatory, Russia We consider a sample of 65 galaxies with negative radial velocities with respect to the Lo cal group in the Virgo cluster. ... E, S0 20 ° The radial velo city VLG ­ magnitude mB distribution of sample ob jects. ... The centroid drift for galaxies ranged by VLG from zero to the extremal negative velo city (-866 km/s). ...

... We have made observations of the Perseus cluster with the Westerbork Telescope at 610 MHz. ... Several newly detected sources are identified with cluster galaxies. ... No evidence is found for the existence of the previously reported ~ 65'x25' cluster halo, 3C 84B. Key words: radio galaxies - clusters - tailed radio sources buoyancy The Perseus Cluster of galaxies is one of the most fascinating systems accessible to extragalactic astronomers. ...

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