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  • 1
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    Fiber Optic Tactical Local Network (FOTLAN) (1991)
    In:  CASI
    Details
    Publikationsdatum: 2013-08-31
    Beschreibung: A 100 Mbit/s FDDI (fiber distributed data interface) network interface unit is described that supports real-time data, voice and video. Its high-speed interrupt-driven hardware architecture efficiently manages stream and packet data transfer to the FDDI network. Other enhancements include modular single-mode laser-diode fiber optic links to maximize node spacing, optic bypass switches for increased fault tolerance, and a hardware performance monitor to gather real-time network diagnostics.
    Schlagwort(e): OPTICS
    Materialart: NASA, Washington, Technology 2000, Volume 2; p 268-275
    Format: application/pdf
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  • 2
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    Improved real-time imaging spectrometer (1993)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: An improved AOTF-based imaging spectrometer that offers several advantages over prior art AOTF imaging spectrometers is presented. The ability to electronically set the bandpass wavelength provides observational flexibility. Various improvements in optical architecture provide simplified magnification variability, improved image resolution and light throughput efficiency and reduced sensitivity to ambient light. Two embodiments of the invention are: (1) operation in the visible/near-infrared domain of wavelength range 0.48 to 0.76 microns; and (2) infrared configuration which operates in the wavelength range of 1.2 to 2.5 microns.
    Schlagwort(e): OPTICS
    Format: application/pdf
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  • 3
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    Interstellar carbon monoxide toward zeta Ophiuchi (1994)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: Interstellar CO A-X bands in the spectrum of zeta Oph were recorded at high Sound-to-Noise (S/N) with grating G160M of the Goddard High Resolution Spectrograph on the Hubble Space Telescope. Isotopic fractionation of CO is severe: CO-12/CO-13 = 167, C(16)O/C(18)O approximately equal to 1550 and C(16)O/C(17)O is greater than 5900 are found where C-12/C-13 = 70, O-16/O-18 = 500, and O-16.O-17 = 2600 are observed or expected. Standard models of the zeta Oph cloud predict CO-12/CO-13 is less than or approximately 70. The higher observed ratio suggests that photodissociation of CO, not the isotopic charge exchange reaction ((13)C(+) + CO reversible reaction (12)C(+) + (13)(CO), is the dominant influence on the CO-12/CO-13 ratio.
    Schlagwort(e): ASTROPHYSICS
    Materialart: The Astrophysical Journal, Part 1 (ISSN 0004-637X); 420; 2; p. 756-771
    Format: text
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  • 4
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    Display system employing acousto-optic tunable filter (1993)
    In:  CASI
    Details
    Publikationsdatum: 2019-08-17
    Beschreibung: An acousto-optic tunable filter (AOTF) is employed to generate a display by driving the AOTF with a RF electrical signal comprising modulated red, green, and blue video scan line signals and scanning the AOTF with a linearly polarized, pulsed light beam, resulting in encoding of color video columns (scan lines) of an input video image into vertical columns of the AOTF output beam. The AOTF is illuminated periodically as each acoustically-encoded scan line fills the cell aperture of the AOTF. A polarizing beam splitter removes the unused first order beam component of the AOTF output and, if desired, overlays a real world scene on the output plane. Resolutions as high as 30,000 lines are possible, providing holographic display capability.
    Schlagwort(e): OPTICS
    Materialart: NAS 1.71:NPO-18736-1-CU
    Format: text
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  • 5
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    High-velocity interstellar gas toward HD 169454 (1992)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-08-28
    Beschreibung: The interstellar spectrum of HD 169454 reveals Na D and Ca K absorption at about + 100 km/s. Measurements made at high resolution resolve 4 narrow (about 2-3 km/s) features whose N(Ca II)/N(Na I) ratios are small. This high-velocity gas is, therefore, unique in that it resembles local quiescent gas, not shocked gas. Redshifted gas is also seen in moderate-resolution spectra of faint stars lying in the same portion of the sky as HD 169454. The resulting picture is one in which a supernova explosion or stellar winds within the Sct OB3 association at a distance of about 1.5 kpc is pushing quiescent gas away from the sun. The gas is seen only in stars estimated to be at most 3 kpc, but greater than 2 kpc, away. If HD 169454 is at this greater distance, its absolute magnitude would be about -9, making it the second most luminous B star in the Galaxy.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astronomical Journal (ISSN 0004-6256); 104; 2 Au; 691-695
    Format: text
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  • 6
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    Frontiers of stellar evolution (1991)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-08-28
    Beschreibung: The present conference discusses theoretical and observational views of star formation, spectroscopic constraints on the evolution of massive stars, very low mass stars and brown dwarfs, asteroseismology, globular clusters as tests of stellar evolution, observational tests of stellar evolution, and mass loss from cool evolved giant stars. Also discussed are white dwarfs and hot subdwarfs, neutron stars and black holes, supernovae from single stars, close binaries with evolved components, accretion disks in interacting binaries, supernovae in binary systems, stellar evolution and galactic chemical evolution, and interacting binaries containing compact components.
    Schlagwort(e): ASTROPHYSICS
    Format: text
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  • 7
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    The boron abundance of Procyon (1993)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: The B I 2496.8 A resonance line and HST/GHRS echelle spectra are used with model atmospheres and synthetic spectra to derive the B abundance of the F dwarfs Procyon (Alpha Canis Minoris), Theta Ursae Majoris, and Iota Pegasi. The B abundance of Theta UMa and Iota Peg is similar to that derived by Boesgaard and Heacox (1978) from the B II resonance line in spectra of A- and B-type stars. These two dwarfs show normal abundances of Li, Be, and B. Procyon, which is highly depleted in Li and Be, is depleted in B by a factor of at least 3. Comparison of the spectra of Procyon and the halo dwarf HD 140283 shows that the B abundance assigned by Duncan et al. (1992) to three halo dwarfs is not greatly overestimated as a result of contamination of the B I line by an unidentified line.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astronomical Society of the Pacific, Publications (ISSN 0004-6280); 105; 687; p. 468-475.
    Format: text
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  • 8
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    Detection of boron, cobalt, and other weak interstellar lines toward Zeta Ophiuchi (1993)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: Numerous weak lines from interstellar atomic species toward Zeta Ophiuchi were observed with the Goddard High-Resolution Spectrograph. Of particular note are the first interstellar detection of cobalt and the detection of boron in this sight line. These measurements provide estimates for the amount of depletion for the two elements. Boron, a volatile, and cobalt, a refractory element, display the depletion pattern found by Savage et al. (1992). The abundance of phosphorus in the H II region associated with the star was obtained from a detection of P III. Additional weak lines from S I, C I, Ni II, and Cu II were detected for the first time; these lines provide the basis for refinements in oscillator strength and column density. Analysis of the neutral sulfur data indicates that the atomic gas is more widely distributed than the molecular material in the main component.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X); 413; 1; p. L51-L54.
    Format: text
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  • 9
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    The abundance of boron in three halo stars (1992)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: B abundances for three halo stars: HD 140283, HD 19445, and HD 201891 are presented. Using recent determinations of the Be abundance in HD 140283, B/Be of 10 +5/-4 is found for this star, and similar ratios are inferred for HD 19445 and HD 201891. This ratio is equal to the minimum value of 10 expected from a synthesis of B and Be by high-energy cosmic-ray spallation reactions in the interstellar medium. It is shown that the accompanying synthesis of Li by alpha on alpha fusion reactions is probably a minor contributor to the observed 'primordial' Li of halo stars. The observed constant ratios of B/O and Be/O are expected if the principal channel of synthesis involves cosmic-ray CNO nuclei from the supernovae colliding with interstellar protons.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astrophysical Journal, Part 1 (ISSN 0004-637X); 401; 2; p. 584-595.
    Format: text
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  • 10
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    Sodium in weak G-band giants (1994)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-07-13
    Beschreibung: Sodium abundances have been determined for eight weak G-band giants whose atmospheres are greatly enriched with products of the CN-cycling H-burning reactions. Systematic errors are minimized by comparing the weak G-band giants to a sample of similar but normal giants. If, further, Ca is selected as a reference element, model atmosphere-related errors should largely be removed. For the weak-G-band stars (Na/Ca) = 0.16 +/- 0.01, which is just possibly greater than the result (Na/Ca) = 0.10 /- 0.03 from the normal giants. This result demonstrates that the atmospheres of the weak G-band giants are not seriously contaminated with products of ON cycling.
    Schlagwort(e): ASTROPHYSICS
    Materialart: Astrophysical Journal, Part 1 (ISSN 0004-637X); 435; 2; p. 797-804
    Format: text
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