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  • 1
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    Orbital variability in the eclipsing pulsar binary PSR B1957+20 (1994)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: We have conducted timing observations of the eclipsing millisecond binary pulsar PSR B1957+20, extending the span of data on this pulsar to more than five years. During this time the orbital period of the system has varied by roughly Delta P(sub b)/P(sub b) = 1.6 x 10(exp -7), changing quardratically with time and displaying with time and displaying an orbital period second derivative of P(sub b) = (1.43 +/- 0.08) x 10(exp -18)/sec. The previous measurement of a large negative orbital period derivative reflected only the short-term behavior of the system during the early observations; the orbital period derivative is now positive. If, as we suspect, the PSR B1957+20 system is undergoing quasi-cyclic orbital period variations similar to those found in other close binaries such as Algol and RS CVn, then the 0.025 solar mass companion to PSR B1957+20 is most likely non-degenerate, convective, and magnetically active.
    Keywords: ASTRONOMY
    Type: Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X); 426; 2; p. 85-88
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  • 2
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    Vision (1973)
    In:  CASI
    Details
    Publication Date: 2005-11-30
    Description: Some data on human vision, important in present and projected space activities, are presented. Visual environment and performance and structure of the visual system are also considered. Visual perception during stress is included.
    Keywords: BIOSCIENCES
    Type: BioTechnol., Inc. Bioastronaut. Data Book, 2d Ed.; p 611-665
    Format: text
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  • 3
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    Experiment S-8/D-13, visual acuity and astronaut visibility (1966)
    In:  CASI
    Details
    Publication Date: 2006-10-26
    Description: Preflight, inflight, and postflight tests of visual acvity of Gemini V and VII crew members
    Keywords: BIOTECHNOLOGY
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  • 4
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    Basic physics and cosmology from pulsar timing data (1991)
    In:  CASI
    Details
    Publication Date: 2006-06-13
    Description: Radio pulsars provide unparalleled opportunities for making measurements of astrophysically interesting phenomena. The author concentrates on two particular applications of high precision timing observations of pulsars: tests of relativistic gravitation theory using the binary pulsar 1913+16, and tests of cosmological models using timing data from millisecond pulsars. New upper limits are presented for the energy density of a cosmic background of low frequency gravitational radiation.
    Keywords: ASTROPHYSICS
    Type: NAS-NRC, High-Energy Astrophysics. American and Soviet Perspectives; p 385-393
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  • 5
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    Ultraviolet, visible, and infrared rays (1975)
    In:  CASI
    Details
    Publication Date: 2006-01-12
    Description: Sources of infrared, visible and ultraviolet radiation are discussed, and important associated biological and psychophysiological effects are described. The problem of protection from excessively high or low levels of radiant energy in these spectral regions is considered and optimal levels are suggested.
    Keywords: AEROSPACE MEDICINE
    Type: NASA, Washington Found. of Space Biol. and Med., Vol. 2, Bk. 2; p 453-472
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  • 6
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    Two new pulsating radio sources. (1969)
    In:  Other Sources
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    Publication Date: 2011-08-12
    Description: Two pulsars discovered during search with transit telescope at U.S. National Radio Astronomy Observatory, tabulating pulsar parameters
    Keywords: SPACE SCIENCES
    Type: ; RO(
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  • 7
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    Radio pulsar timing observations for GRO (1990)
    In:  CASI
    Details
    Publication Date: 2013-08-31
    Description: Gamma rays probably provide the best diagnostic tool for probing the enigmatic physics of pulsar magnetospheres. At present, however, only two pulsars - the young, nearby ones in the Crab and Vela X supernova remnants - are reliably detected at gamma-ray energies. With adequate radio observations to provide independent timing information, Gamma Ray Observatory should be able to detect a number of additional pulsars, and the results will be of great benefit in testing magnetospheric theories and models. Timing observations for this purpose were started at a number of radio observatories around the world. The general procedures being used are described. A status report on the work is given.
    Keywords: SPACE RADIATION
    Type: NASA, Goddard Space Flight Center, The Energetic Gamma-Ray Experiment Telescope (EGRET) Science Symposium; p 81-87
    Format: application/pdf
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  • 8
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    New pulsating radio source. (1968)
    In:  Other Sources
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    Publication Date: 2011-08-12
    Description: New pulsating radio source, deriving pulse dispersion and giving position
    Keywords: SPACE SCIENCES
    Type: ; UGREVUE(
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  • 9
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    High-precision timing of millisecond pulsars. II - Astrometry, orbital evolution, and eclipses of PSR 1957 + 20 (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Pulse time-of-arrival measurements have been acquired for PSR 1957 + 20 on 61 days over a 2.7 yr interval, including the times of 44 eclipse disappearance or reappearance events. The timing data provide a reliable measurement of the pulsar's proper motion, 29 +/- 3 mas/yr, at position angle 216 +/- 6 deg; this direction is in excellent agreement with that suggested by the cometlike shape of a surrounding optical emission nebula. The rate of change of the orbital period has been measured: a surprisingly large (-3.9 +/- 0.9) x 10 exp -11, implying that significant orbital evolution must take place on a time scale of 30 Myr. Finally, the present observations extend the eclipse measurements to higher frequencies and provide better statistics for these highly variable phenomena. The eclipse data are used to compute a column-density profile of free electrons in the outer parts of the eclipsing region, and thereby provide an important glimpse into the material being ablated from the companion star.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 380; 557-563
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  • 10
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    The Parallax of Pulsar 0950+08 and the Local Free Electron Density (1984)
    In:  CASI
    Details
    Publication Date: 2014-09-16
    Description: A parallax of 7.9 + or - 0.8 mas for PSR 0950+08, corresponding to a distance of 130 + or - 15 pc is reported. The measured pulse dispersion of this pulsar implies an average free electron density of 0.023 + or 0.002/cu cm along the line of sight. This parallax measurement is subject to systematic errors and questions of interpretation which are not yet fully explored.
    Keywords: ASTROPHYSICS
    Type: NASA. Goddard Space Flight Center Local Interstellar Medium, No. 81; p 281-283
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