Results 11 to 20 of about 2,140 (245)
Astrometry with Wide-Field Telescopes in the Abastumani Astrophysical Observatory [PDF]
Symposium - International Astronomical Union, 1994 For the past 30 years purposeful, highly accurate photographic observations have been carried on in Abastumani to solve a series of astrometric problems. The principal observational instruments are a 70 cm Maksutov system mirror telescope — AS-32 (F = 2100 mm) and a 40 cm double Zeiss astrograph (F =
R.I. Kiladze, S.M. Chanturiya
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Study of the Blazhko Type RRc stars in the Stripe 82 Region Using SDSS and ZTF
The Astronomical Journal, 2023 RR Lyrae stars (RRLs) are pulsating stars, many of which also show a long-term variation called the Blazhko effect which is a modulation of amplitude and phase of the lightcurve.
Vaidehi Varma +2 more
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PROGRESS IN THE STUDY OF DECAMETER-WAVELENGTH SOLAR RADIO EMISSION WITH UKRAINIAN RADIO TELESCOPES. Part 1. (Invited paper) [PDF]
Radio Physics and Radio Astronomy, 2023 Subject and Purpose. Results are presented of the solar corona investigations performed with the world famous Ukrainian radio telescopes. The work has been aimed at offering a consistent review of recent achievements in observations of a variety of low ...
A. A. Stanislavsky +3 more
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UniverseThe Lobster Eye Imager for Astronomy (LEIA) is the pathfinder of the wide-field X-ray telescope used in the Einstein Probe mission. In this study, we present an image of the Virgo Cluster taken by LEIA in the 0.5–4.5 keV band with an exposure time of ∼17.
Wen-Cheng Feng +11 more
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Obstructed Telescopes Versus Unobstructed Telescopes for Wide Field Survey—A Quantitative Analysis [PDF]
Publications of the Astronomical Society of the Pacific, 2014 Telescopes with unobstructed pupil are known to deliver clean point spread function (PSF) to their focal plane, in contrast to traditional telescopes with obstructed pupil. Recent progress in the manufacturing aspheric surfaces and mounting accuracy favors unobstructed telescopes over obstructed telescopes for science cases that demand stable and clean
Singaravelu, Balasubramanian +1 more
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Angewandte Chemie, EarlyView.A regio‐ and diastereoselective method for strain‐release pentafluorosulfanylation of carbonyl‐containing 1,3‐disubstituted [1.1.0]bicyclobutanes (BCBs) was developed that led to several fortuitous discoveries. For instance, the resultant SF5‐cyclobutanes (SF5‐CBs) exhibit close SF5⋯C═X contacts (X = C, N, O) and provide synthetic access to a new class
Alexander M. Stephens +9 more
wiley +2 more sources
PSF-based Analysis for Detecting Unresolved Wide Binaries
The Astrophysical Journal Supplement Series, 2023 Wide binaries play a crucial role in analyzing the birth environment of stars and the dynamical evolution of clusters. When wide binaries are located at greater distances, their companions may overlap in the observed images, becoming indistinguishable ...
You Wu +7 more
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Wide-field corrector for a Gregorian telescope
Astronomy Reports, 2007 12 ...
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Wide Field X-ray Telescope: a moderate class mission [PDF]
SPIE Proceedings, 2010 Sensitive surveys of the X-ray universe have been limited to small areas of the sky due to the intrinsically small field of view of Wolter-I X-ray optics, whose angular resolution degrades with the square of the off axis angle. High angular resolution is needed to achieve a low background per source, minimize source confusion, and distinguish point ...
S. S. Murray +16 more
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Comparison of beam combiners for a synthetic aperture imaging telescope [PDF]
Journal of the European Optical Society-Rapid Publications, 2006 Future astronomical space missions will comprise a constellation of several optical telescopes to detect exo-planets by interferometric nulling of starlight.
van der Avoort Casper +3 more
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