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  • 1
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    A CCD System for Photometry of Direct and Spectroscopic Images (1984)
    In:  CASI
    Details
    Publication Date: 2014-09-18
    Description: A charge-coupled device (CCD) for direct imagery at the focus of a ground-based telescope and for high dispersion spectroscopy of stars is evaluated. The CCD is an RCA SID 53612 thinned, buried channel array of 512x320 30-micron square pixels that are back-illuminated and refrigerated to about -60 C in a rugged, RF-shielded vacuum housing. The double-correlated sampling (integrator) readout system, the Z80 microprocessor readout control system, and the data collection system are described. The readout noise is 120 electron-hole pairs (ehp) per pixel per readout, the thermal dark current is 50 ehp/pixel/sec, and the scale of the 12-bit analog-to-digital converter is 25 ehp/AD unit. Unique features of this system are compared to other astronomical implementations of the same model of CCD.
    Keywords: ASTRONOMY
    Type: NASA. Ames Research Center Proc. of the Workshop on Improvements to Photometry; p 137-151
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  • 2
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    The LPL radial accelerometer (1985)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The LPL stellar accelerometer, an interferometrically calibrated spectrometer, is described. Particular attention is given to light feed, image scrambling, and interferometric wavelength calibration. Changes in radial velocity are inferred from changes in the relative intensities of starlight transmitted through the Fabry-Perot.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
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  • 3
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    A Fabry-Perot interferometer for accurate measurement of temporal changes in stellar Doppler shift (1986)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: The scrambling of incident light by an optical filter, and the stability obtainable through wavelength calibration by means of a tilt-tunable Fabry-Perot etalon, allow the accurate observation of Doppler shift changes in stellar absorption lines. Distinct, widely spaced monochromatic images of the entrance aperture are formed in the focal plane of the camera through a sampling of about 350 points on the profile of the stellar spectrum by successive orders of interferometric transmission through the etalon. Changes in Doppler shift modify the relative intensities of these images, in proportion to the slope of the spectral profile at each point sampled.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
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  • 4
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    Photometry and polarimetry of Titan - Pioneer 11 observations and their implications for aerosol properties (1982)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: Pioneer 11 measurements of Titan's limb darkening and polarization at red and blue wavelengths are refined, and the integrated disk brightness measurements at phase angles from 22 to 96 deg, over which Titan's phase coefficient averages about 0.014 magnitudes/deg in both colors, are reduced. Comparisons of the data with vertically homogeneous multiple scattering models indicate that the single-scattering phase functions of the aerosols in both colors are flat at scattering angles between 80 and 150 deg, with a small peak at larger scattering angles. Although a vertically homogeneous model in which particles are assumed to scatter as spheres cannot simultaneously match the polarization observations of both colors for any refractive index, observed polarizations are most sensitive to the particle properties near optical depth 1/2 in each color. Models based on single scattering by spheres can therefore be successful over a range of refractive indices, if the size of the particles increases with depth and if the cross section of the particles increases sufficiently rapidly with decreasing wavelength.
    Keywords: ASTRONOMY
    Type: Icarus; 51; July 198
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  • 5
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    Long, accurate time series measurements of radial velocities of solar-type stars (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: We have been measuring changes in the radial velocities (RV's) of solar-type stars to search for gravitational perturbations by planets. We transmit violet starlight through a Fabry-Perot etalon interferometer and sense changes in Doppler shift from changes in the fluxes of light on the slopes of stellar absorption lines. Our data now span 6 years. Our observations of the Sun showed earlier that both our technique and the profiles of solar photospheric violet absorption lines can be stable enough to reveal planetary perturbations. We now carry this validation to the spectra of other near-solar-type to reveal planetary perturbations. We now carry this validation to the spectra of other near-solar-type stars. Annual averages of our RV's of sigma Draconis and beta Virginis are stable to plus or minus 6 m/s. The slope of our five-year series of RV's of xi Bootis A is consistent with the star's well-determined visual astrometric orbit about xi Bootis B. The Fabry-Perot technique of Doppler shift measurement is fully capable of detecting perturbations due to planets with masses and orbits similar to those of Jupiter
    Keywords: ASTRONOMY
    Type: Astrophysics and Space Science (ISSN 0004-640X); 212; p. 271-280
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  • 6
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    Long-term stability of a Fabry-Perot interferometer used for measurement of stellar Doppler shift (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The use of a fiber-optic-link CCD-detector Fabry-Perot interferometer (McMillan et al., 1985, 1986, and 1988) to obtain high-accuracy measurements of stellar Doppler shifts at KPNO is described in detail and illustrated with sample data. Particular attention is given to accuracy requirements and techniques for reducing errors, resolution (orders of 50 mA at wavelength 4300 A are separated by 640 mA), CCD sensitivity, observing and data-processing operations, and the control of environmental conditions. Standard-deviation data and statistics on seven solar-type stars are presented in tables, and the time evolution of the radial velocity of Beta Com is shown in a graph.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Instrumentation in Astronomy VII; Feb 13, 1990 - Feb 17, 1990; Tucson, AZ; United States
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  • 7
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    A hydrogen flame ionization detector for Martian/lunar life detection experiments (1970)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Hydrogen flame ionization detector /HYFID/ for life-derived organic matter in Martian/Lunar soil
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: INSTRUMENTATION IN THE AEROSPACE INDUSTRY. VOLUME 16 - INSTRUMENT SOCIETY OF AMERICA, INTERNATIONAL AEROSPACE INSTRUMENTATION SYMPOSIUM, 16TH; May 11, 1970 - May 13, 1970; SEATTLE, WA
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