... Amorphous carbonaceous materials can show a great diversity of optical properties due to the variability in their microstructure. ... The differently pyrolized celluloses are representative for a suit of carbonaceous material ranging from strongly disordered (insulating) to graphitized (conducting) material. Figure: Complex refractive index of hydrogenated amorphous carbon prepared by pyrolysis (annealing) of cellulose at different temperatures. ...

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FF Aqr DW Period is significantly greater than typical value for DW type. According to Pojmanski [45] this star is DCEP-FU: variable. According to Sipahi et al. [263] it is one of the few binary systems which consists of the hot subdwarf and cool chromospherically active giant components. ... Belongs to long-period RS CVn systems, secondary is more massive and more larger (volume of the secondary is approximately 100 times larger than that of the primary component). ... So may be SA system? ...

... Tonight's Sky . ... The Magazine . ... Star Atlas . ... An artificial comet holds secrets to Earths life . ... Astronomy for Kids . ... Observing springtime deep-sky objects with a large telescope . ... The planet has extreme temperature swings and perhaps active lava flows. ... A digital supplement to Astronomy magazine. ... Join TravelQuest International with Astronomy and Discover magazines on one of three great tour options surrounding this celestial spectacle . ... Astronomy Magazine . ...

... Discussions about options for introducing polarizing optics to the high resolution spectrometer NES, recently developed at the 6m telescope by V.Panchuk, have also been held. ... A strong double-peaked emission in the H-alpha line was found in 1985 and explained in terms of a rotating equatorial disk model, first proposed by Jones et al. (1993) for this object. ... Based on high resolution optical spectra we obtained in 1995, the effective temperature Teff=8500K has been estimated for IRC+10420. ...

The SCUBA Local Universe Galaxy Survey Dust along the Hubble sequence Catherine Vlahakis University of Bonn Collaborators: Steve Eales (Cardiff University) Loretta Dunne (University of Nottingham) Overview What is SLUGS? Results from the survey Recent work using SLUGS results ­ the FIR-radio relation Introduction: SLUGS SLUGS ­ a submm survey of galaxies in the local Universe ­ at 850m and 450m Survey of ~200 nearby galaxies: 104 60m-selected ("IRS") (Dunne et al. ...

Interaction of G a A s with intrinsic stimulated intensive picosecond emission . The results of the studies of the above interaction, obtained in Kotel'nikov IRE of RAS, are presented here in brief. ... I. In our investigations of the spectrum of GaAs bleaching (transparency increase) under picosecond optical pumping, we found that density n = p  and temperature р Я 25 meV of electron-hole plasma (EHP) vary approximately reversibly (with inertia of about 10 ps) in relation to the pumping [ 1,2 ]. ...

Super Rocket Targets . NPO MOLNIYA has been designing rockets-targets for over 30 years using the great experience in crea-ting anti-aircraft guided rockets (AGR) for C-25M. On the basis of B-300 anti-aircraft rockets which expired their service life, there were designed, tested and put into the serial production the following types of the rocket - ... The analogue of this system successfully passed the state tests with the ZVEZDA-4 rocket-target. ...

... Radio-astronomy - the First Branch of Non-Optical Astronomy. Mechanismes of Radiation Generation by Astronomical Bodies. Laws of Blackbody Emission for R-Range. ... Characteristics of Radiation: Spectrum, Polarization. ... Conception of Antenna Temperature. ... Radio-astrometry: Methods of Determination of Radio Sources' Coordinates and Their Measuring by Interferometers. ... Morphology and Basics of Solar Radiation Physics: the Main Component, Slow Changing Component, Sporadical Radiation. ...

Mal Ruderman (KIPAC, Stanford) . What do we see when we look at the surface of a neutron star from a great distance? ... The new point that is made is a consequence of near-relativistic electron-positron flows expected in the near-magnetosphere's of "young" (not older than about a million years) neutron stars. Because of cyclotron resonance scattering by these pair-flows on surface X-ray and UV emission, we do not see unprocessed suface emission. ...

... Home Observing Great Kills, Staten Island . ... Clear Sky Chart . ... Great Kills, Staten Island . ... Beyond New York City . ... Observing Resources for Amateur Astronomers - Part 1: Beginning Observers . ... A History of the First Forty Years of the Amateur Astronomers Association . ... Amateur Astronomers Medal . ... Take the Verrazano-Narrows Bridge (1 on Staten Island map) to Staten Island. ... 2016 Amateur Astronomers Association of New York Designed by Press Customizr Powered by . ...

... Galaxies 81 High resolution HCN and HNC spectroscopy in dark interstellar clouds A.V. Lapinov Institute of Applied Physics of the Russian Academy of Sciences, Nizhny Novgorod, Russia Introduction Dense cores in dark clouds are associated with regions of low mass star formation. ... The fact that in all observed by us starless dark clouds HCN F=2 1 and F=1 1 lines are self-reversed gives HCN molecule a good probe to search for collapsing cores in dark clouds. ...

... In this example, with Mizar consisting of two identical components, we can just apply the classic CLEAN deconvolution algorithm in conjunction with a phase self-calibration step ("hybrid mapping") to the combined data of all NPOI channels. ... It is a clickable map for explanations of the maps and buttons. ... If we grab the slider, after a brief delay it will be movable and we can study the changing residual and final maps as a function of the number of CLEAN components subtracted. ...

... Minute Values of Geomagnetic Field Components . ... AA 1868 - Present (3 hourly and daily) (monthly) (yearly) (Lists and histograms of geomagnetic disturbance and Solar Sunspots) KP_AP 1932 - Present (3 hourly and daily) (Lists and histograms of geomagnetic disturbance and Solar Sunspots) AE_HV 1957-75, 78-88 (hourly) AE_MIN 1978-881-6;198903;1990-94 (minute) DST 1957 - Present (hourly) PC 1975 - Present (15-minute) AMANAS 1959 - Present (3 hourly and daily) KMKNKS 1983 - Present (3 hourly) . ...

The black hole. ... The black holes are generated in the result of a collapse of giant stars with the mass more than three Sun's masses. ... And moreover the gas near the neutron star or the black hole will get hot and will become a source of high energetic electromagnetic radiation in X-rays and gamma range. ... In the majority of double systems, being the sources of X-rays radiation, the invisible component mass does not exceed the two solar masses, so it is a neutron star. ...

... Armagh Observatory, College Hill, Armagh BT61 9DG, +44 (0)28 3752 2928 . ... We present the numerical simulations for an electron-beam-driven and loss-cone-driven electron cyclotron maser (ECM) with different plasma parameters and different magnetic field strengths for a relatively small region and short time-scale in an attempt to interpret the recent discovered intense radio emission from ultracool dwarfs. ... A wide frequency band should therefore be covered by future radio observations. ...

... Determination of the Permissible Solutions Area by Image Reconstruction from a few Projections: Method 2­CLEAN DSA Michail I. Agafonov Radiophysical Research Institute (NIRFI), 25 B.Pecherskaya st., Nizhny Novgorod, 603600, Russia, E­mail: agfn@nirfi.nnov.su Abstract. ... Application The problem requires the solution of the equation G = H # F (+noise) , (1) where F (x, y) is the object brightness distribution, H(x, y) is the fan (dirty) beam, and G(x, y) is the dirty (summary) image. ...

... Apr 14, 2016 - Monthly Meeting . ... The Amateur Telescope Makers of Boston, Inc. ATMoB) is an astronomy club devoted to telescope making, observing, and studying the heavens. ... CURRENT MOON . ... April Sky . ... Lyrids Meteor Shower . ... Sources: NASA JPL Space Calendar , StarDate Online , Sky Telescope , Harvard-Smithsonian Center for Astrophysics , RASC Observer’s Handbook , Abrams Planetarium Sky Calendar and Astronomy Magazine . ... Copyright (c) Amateur Telescope Makers of Boston, Inc. ...

... A tussle in the distant Universe. This Hubble Space Telescope image shows evidence for a merger between a quasar and a companion galaxy. The quasar is the bright object just beneath the image center, and the wisps of material around it are remains of a galaxy disrupted by the interaction between it and the quasar. ... Galactic Nuclei: Old Quasars? Quasars as Probes of the Distant Universe . ... Quasars. ... The name quasar is made up with parts of the words "quasi-stellar radio." ...

GCVS Variability Types and Distribution Statistics of Designated Variable Stars According to their Types of Variability ======================================================================== I. GCVS Variability Types. ... Amplitudes usually do not exceed 0.1 mag. ... RR Variables of the RR Lyrae type, which are radially-pulsating giant A-F stars having amplitudes from 0.2 to 2 mag in V. Cases of variable light-curve shapes as well as variable periods are known. ... RV Variables of the RV Tauri type. ...