Results 221 to 230 of about 5,110 (265)
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THE RISE OF ULTRAVIOLET ASTRONOMY IN FRANCE
Journal of Astronomical History and Heritage, 2021France was one of the few countries able to launch rockets soon after the end of WWII. Some of these rockets were used to observe the Sun and other astronomical targets in the ultraviolet in the early 1960s. This program continued with the placement of French UV cameras and spectrographs in the French satellite D2B-Aura (1975), in two Soviet satellites
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Galactic Astronomy in the Ultraviolet
Solar System Research, 2017We propose a number of prospective observational programs for the ultraviolet space observatory WSO-UV, which seem to be of great importance to modern galactic astronomy. The programs include the search for binary Cepheids; the search and detailed photometric study and the analysis of radial distribution of UV-bright stars in globular clusters (“blue ...
A. S. Rastorguev +2 more
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Galactic ultraviolet astronomy
Reports on Progress in Physics, 1987A general presentation of astrophysical observations in the ultraviolet is given. First the particular nature of ultraviolet studies is emphasises. This is followed by a brief historical presentation of some of the typical instrumentation used. Then, in the framework of galactic observations, some of the most important results obtained concerning the ...
A Vadal-Madjar +5 more
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Aspheric grating for extreme ultraviolet astronomy
Applied Optics, 1978A family of plane curves is developed which can diffract incident parallel rays to a point focus. These curves, termed diffractoidal curves, are rotated around an axis to produce surfaces of revolution correspondingly termed diffractoids, whose imaging properties for sources at infinity are studied by ray tracing in a few examples.
S O, Kastner, C, Wade
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A Discussion on astronomy in the ultraviolet - A search for ultraviolet objects
Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 1975Abstract The observations of the sky-survey telescope in the TD-1A satellite are being searched for ultraviolet objects. The first results, covering about 10 % of the sky, are presented and rough limits on space density and luminosity are derived.
D. J. Carnochan +4 more
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Astronomy and the Extreme Ultraviolet Explorer satellite
Science, 1994The extreme ultraviolet wave band (100 to 912 angstroms) was thought until recently to be useless to astronomy, primarily because the opacity of the interstellar medium would prevent observations at these wavelengths. However, the interstellar medium has been found to be markedly inhomogeneous in both density and ionization state and the sun is ...
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A Discussion on astronomy in the ultraviolet - Stellar studies in the balloon ultraviolet
Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences, 1975Abstract Observations with a spectral resolution of 0.01 nm have been made for several stars in the balloon ultraviolet. For the two coolest stars studied ((3 Ori and a Lyr) wavelengths of all observed spectral features in the range 273-288 nm are given with an accuracy of approximately ± 0.004 nm.
B. Bates +6 more
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Skylab ultraviolet stellar astronomy experiment S019
Applied Optics, 1977An objective-prism stellar spectrograph of 15-cm aperture was flown on all three Skylab missions. The wavelength region from 1300 A to 5000 A was covered by a special optical system containing a combination of reflecting telescope optics, a CaF(2) objective prism, and an achromatized field corrector lens system of CaF(2) and LiF.
F G, O'Callaghan, K G, Henize, J D, Wray
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